Sbc 350 gas mileage. 5 mpg/tank and I do about 75% highway, 25% other.
Sbc 350 gas mileage $5000 limit. Plenty of seating and doesn't look bad. C3 General - What kind of gas mileage for a 350 - Trying to find an average for gas mileage for those with a 350 and auto trans that you are getting. I don't punch the car often and most cruising down the road is done at Same with gas mileage. 42 rear end: 15-16 mpg highway (this was the last year Chevy put the 350 in a pickup) Hence comes my question. Gas mileage doesn't matter, but I would like to keep the overall cost under $5000 for just the engine. 73 What kind of gas mileage are you getting with your 283? it appears you have the same heads as my dad's 327 does! opt for a slightly higher compression 283 if milage is a concern. Not a very good payback. Joined Feb 14, 2002 · 3,464 Posts #21 · May 18, 2005. 73 rear gear So, you see, best fuel mileage lets me go to more places, with the big Chevelle smile on my face . PorknBeaner has one in his SBC with Twisted heads and could get over 20mpg out of it when he had it in a 4000lbs. 70s) 71 Nova 406(11. 00's. 568 miles per gallon overall and that's burning 87 octane in a stock L34 with an automatic and stock 3. The conversion wont be terribly expensive bell housing,clutch, and slave cylinder kit about $600. Heres the question; What engine will get better gas mileage with a 700R4 in a 1968 to 1972 El Camino. But that is another story. Road car. 5 to 1 so it will be pump gas friendly and I run a turbo 350 transmission with a Search by Model. I really don’t care if mpg improves, gas is under $2. Using regular fuel. 10 Cummins turbo diesel . 2399 posts 1975 Jeep Wagoneer: 350 SBC, TH400, Q/T, D44's 3. Someone I spoke to said these are pretty high for an SBC350, but it could just be a very Building SBC 350 for mileage. Hi All, Looking for thoughts on my compression test results as shown in the attached image. I just figured out my gas mileage average for the last five years. Stock mechanical fuel pump, TH400 trans, 3:73 gearing, 350sbc w/Edelbrock Performer, Hedman headers, stock cam. 08 and get 12/16 mpg and most likely will make more power. Mine is a 71 with a 360ci 12. _____ Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60 What I am thinking about is a 350 sbc w/ electronic fuel injection (multi port, tuned port or throttle body), a programable ECU, 200 or 700 R4 transmission, 2. I roll across the scales at 4500 with my big butt in it. I'm not to light on the gas peddle. 73 rear gear. Re: Advantages of advancing the cam on a street I think if I do a sbc conversion I will get as good or better fuel mileage than the original 4 cyl engine. 0 miles per gallon. Merci pour le retour. Currently an old 625cfm Carter on it. I filled the tank up about halfway on tuesday (like 7 gallons) and it's gone already. The whole panel shouldn't weigh in much more then a couple thousand pounds. 73 gears. i say try it out and see what happens. With 3. I have a 454 in my pull truck and it drinks gas like water. A car buddy wants to convert his 350 SBC 290 HP crate motor over to EFI for better hi-way mileage, Put in the 350/700r4 with AC and I got better gas mileage with enough power to cruise the freeways with ease. C-10. My 16 gal poly tank lasts about 100-125 miles which equates to 7-9 MPG. 3", 3200 lbs. You may get close. New pistons of course mounted to the original rods. 00 per year or 65. website for more specs) my question is if it is worth doing the stroker verses leaving the 305 relatively stock. Sbc 350 what cam should I use. Thats about 300 miles each weekend counting in the town driving. Does anybody know However, I rather think that 18 mpg out of a 350 without port fuel injection on a 3/4 ton truck is a stretch. You will find most of the mileage gain will be in ignition timing and gearing. 6:1 range helps, but the mileage benefits of a 2,000-rpm cruise can be easily nixed by an untuned carb dumping a 10:1 Yes, having an overdrive to slow the final drive ratio down to the 2. Bounce this off a cam guru or Vizard wannabe, but as far as the combination goes, for 69 Camaro 1977 350 Shift kit, Pertronix ignitor, holley 600 Lots of little things add up to make for good gas mileage. g. 1991 CAPRICE CLASSIC 350 160,000 CUSTOM 20'S STOCK 2 TONE 1991 caprice 305 payed $600 sold 4 $1200 1965 OLDSMOBILE STARFIRE 425 BIG BLOCK 375+- HORSES SMASHES ON FORDS:yahoo: k3: the original motor is not the best choice for performance and fuel economy. With 33" BFG K02. 2degrees is a waste of time. Some times 13. Heads are #416 Lt1 gas mileage average - 15 to 20 mpg Chevy 350 gas mileage average - 5 to 12 mpg I average 18-20 MPG on my commute, about 400 miles per week. Would the 350 be enough to Fuel Pump SBC 350 Engine & Drivetrain. The only secret I know of is to put an oxygen sensor with a readout meter on the car. Building SBC 350 for mileage. 00 for the time being. Another case in point, a 1982 Chevy Caprice with a V8 got better gas mileage than the same '82 Caprice with the 4. Join Date: Jan 2017. I think the port injection is the way to go if you are going to add EFI. bareit Discussion starter. What would be a good guess on fuel mileage on a FJ40 with stock engine and stock carb? Specify the type engine you have. It seems the bigger, hotter the engine you have, most get a "lead foot":sign0020: and you can figure out gas mileage will suffer:bowtier: Save Money & Fuel. Plenty of seating. Join Date: Oct 2021; Posts: 12; Share Tweet #1 Fuel mileage tuning, tuning in general 350 sbc 10-31-2021, 07:52 PM. the "correct" cam for a 283 will be smaller than a 350, also helping mpg. 0-60: 3. I want to mary it to a tbi One of the best cams for a SBC is the L-79 cam. 0. 08. Not 2900 as was stated. 00 Driven sanely your gas mileage will be near the same, a stock 350 slightly betterif you keep putting the right foot down hard the 383 will suck gas down like there is no tomorrow. Same as above, but maybe better gas mileage? 5. 1996 FJZ80 - Locked - 3" OME Heavy - 255/85R16 KM2's - ARB Front - Superwinch S9000 - MetalTech Sliders - Kaymar Rear I've asked before, not sure if here though, about dialing in the timing on my SBC 350. The mileage advantage goes away as soon as you open up those very large vacuum secondaries. Both are swirl port head’s from 1987 through 1995. Save Share Blacksurt I just bought a SBC 350 all stock. Jump to Latest 15K views 7 replies 7 participants last post by ChevelleSS_LS6 Mar 28, 2005. Thanks guys, Carlos. We will start with the exhaust since its on the tail of the motors processes. On the order of ~5 mpg in town and ~7 mpg on the freeway. It's the law. If you are going to put money in an engine a 350 sbc would be a far superior engine and likely help resale if that floats your boat. I was amazed by this I have talked with others who say similar things e. Once you get used to the power of the larger engine and start driving more normally, you use the bigger engine's torque to move the car and it operates with a more efficient fuel-air mixture because 78 Nova 2. If I baby it, I've seen 17 MPG, I believe 18 MPG is not out of the question. 53 Chevy truck, 700R4 trans, 4. I currently have a Comp Cams 12-234-2 Xtreme 4x4 cam that I can use: Cam Style Hydraulic flat tappet Basic Operating RPM Range 1,000-5,200 Intake Duration at 050 inch Lift 212 I have one in a full size 1/2 ton PU with a 700R4 and 2. I think the advantage to the new engine is the drivability in less than ideal conditions. I'm planning my next project and really want a mileage friendly engine. 08's. Chevy 350, Edelbrock manifold, Edelbrock 750cfm carb, hooker headers, 700r4. '72 240Z, 383ci SBC, 200-4R, 850 CFM Q-jet. The words VJ40 and economy cannot be used in the same sentence. 08 rear, but I didn't take it easy on the truck either. a truck with a 350 that was changed out for a 454 and got better fuel economy with the 454. but I want to get the max fuel MPG and also cut down on Co2 emissions. Manual chock ok because it's already there. 3L: Gas mileage? 08-06-05 11:08 AM - Post# 754692 In response to Number21 You are not likely to get the gas mileage of the new GM trucks even with the internal components of the new trucks. 1971 Malibu, factory buckets/full gauges/console, 383 roller cammed small block, Turbo 400, 3. 3. 10 regs with a small set of real slicks! Gas mileage be damned, install 4. Street Edge 10" 2800, 8. The big difference is that new trucks are designed to be more aerodynamic and a 1979 truck is a steel box with a flat front. The engine is in a fairly heavy 4x4 vehicle 4000 lbs. 5 to 13. 350 parts are more readily available and sometimes cheaper than the older engines, but I would be inclined to run the short block i had, get the compression about 9-9. Save Share A few questions about gas mileage and practical use of a daily streetable application of 350 vs LS1, risk/work and reward. i've been driving for 2 weeks now and the gas mileage is absolutely awful. 383 SBC. I got about 12-13 in the city and 16-18 on 9 miles per gal, 383 stroker sbc (carb), 700r4, atlas 4. 6:1 range helps, but the mileage benefits of a 2,000-rpm cruise can be easily nixed by an untuned carb dumping a 10:1 Now my truck gets 8 to 9 city and 13 to 14 highway. My average for 15k miles last year is 13. Some guys are doing low to mid 20's with carbed 350's and 383's with the double over-drive of the T56 transmissions. Jump to Latest My chief concerns are achieving reasonable gas mileage and a reliable power increase. 55 rear. The 4. 440 cam and 305 heads? You will good Gas Mileage on the Small 2 Front Barrels and when want great Perf from the Big Back Barrels Car came with a virgin 400 SBC which I planned to make an easy 500 ft lb with but. 10's On an average scale, a supercharger should be able to add a power boost of about 46 percent to the SBC 350 engine’s original horsepower specification. with 272/284 Crane Powermax Camshaft 216/228 @50" And I wasn't satisfied with the low end power in that engine, that was also with 38" tires, 4. but I want to build my 350 for mileage (and low end torque) to put in my light rig ('66 Land Rover). Keep your full advance timing I vote SBC or keep the TBI 350 set-up in there. 5 bore. Sort by Oldest first Oldest first Newest first Most reactions. The early LT1s had speed density air/fuel management and batch-fire fuel injection, but in 1994 Chevy updated to a mass airflow (MAF) system and more precise sequential fuel injection. 5 sometimes 12. My '56 has a completely rebuilt and stock 1965 283 with Rochester two barrel. After installing the Sniper and running for a few weeks with the initial air/fuel settings as mentioned, I saw roughly 1 ½ to two-miles per gallon increase. If using Vortec L31 heads or heads with a quick-burn design, limit total spark advance to 34 degrees. SBC 350 Build for Truck. Je recherche des informations sur le moteur Chevrolet SBC 350 L46. It kept the vehicle from lugging during take off. Registered User . Jump to Latest block will be decked and using a felpro 1003 head gasket which yields me a little close to 9. 56:1 gears in the rear end TH350 stock 1100 rpm converter . 1964 C10 Ran 348W for 6 years, now SBC. I am getting a th350 tomorrow. 7:1 but that is far I've got a mild 350 SBC engine build going together for my wife's ride. Also, no lumpy cam, but something moderate that will breathe better than the stock 350 cam, especially at lower-mid RPM. 350 SBC, 350 TH, 2. At least build a high torque 400 sbc with a 3. ) When I did the turbo 350 conversion, using outside tire diameter, rear ratio calculation. Plug vacuum advance into full manifold vacuum. I average 12. Better fuel economy and it will run better than a carb off-road on different angles all while building less heat. 305 What have you guys done to make your 350 more fuel efficient (or any small block chevy)? im aiming for 300hp that gets atleast 25 mpg highway. However, BBC gas mileage is just bad. Filter. Guys, I might be soon looking for a new carb for my truck. So basically I need to get as good gas mileage as possible. This is because the small primary bores keep air velocity up for better atomization of the fuel (liquid gasoline will not burn), only gasoline vapors in a ratio of 12. 42 rear end: about 15 mpg highway 1985 2WD Suburban with 3. 5. Right now, in my 454 BBC and TH400 with 2. An overdrive transmission of any kind with fuel injection should get you into the low 20's. B. Time. Search by make for fuel efficient new and used cars and trucks And don't forget an M-20 or -21 Muncie 4-speed and say some 3. 421/. It could possibly be less,but thats the lowest that I actually measured it. Whew, someone doesnt Yes you can get good mileage out of the old school chevy. 060 over to get the cylinders right. Both carburetors work(ed) very well. MrWillys · Registered. Cam choice sounds ok and if you stay out of the secondary's on that Q jet it should be pretty fuel efficient. Only show this user. 60 over flat top pistons, ISKY 270/280 Cam, Balanced, stock heads (1974) that have been machined, and an Q-Jetted 350, H42, 3. Not a tremendous amount of lift, but designed by Duntov and will pull to over 7K if need be. P. The AFB carb lends itself to easy tuning for mileage because of the sequential metering rod design thus varying the effective jet size. 76/1 open rear end and 28 inch radial tires. Just wondering. then I don't buy the notion that 305 has any chance of getting the mileage of a 350 that's I won’t build another big inch SBC myself, I dropped $15k on my current 421”,i bought every individual part, right down to the bolts. It's 10. Mike . 5:1- 2. I was gonna hot rod the thing up all the way, but right now it looks like I'm gonna need commuting transportation to get to myself to work every day in this truck for quite a while, so my motivation has changed, I'd like something sort of peppy that gets pretty good gas mileage! We start with a nice basic Chevy 350 build parts list and move through such options as 400 hp 350 Chevy recipe, 500 hp 350 Chevy recipe, and even a 350 SBC turbo build. If you want better gas mileage take the Holley off and put a Edelbrock 500 on. For 2 years I drove Odessa to Lubbock, then returned every weekend. For a "best scenario" mpg run, get out on level Interstate, traveling at a GPS-corrected speed (say, 60 mph) after topping tank to first click-off; run 30 miles out and 30 miles back to same station, same pump; fill same way. 54:1's. M. Therefore less work and less effort means less wear & tear and less gas to propel the same mass equals better fuel economy. 73 gears, I get better gas mileage at 70 mph than I do at 55. The Swirl Port head’s were specifically made for grunt motors at low RPMs that deliver good fuel specific numbers. com Rochester QuadraJet then you already have the best carburetor ever made for mileage. Better Whats Gas Mileage???? Chevy, HUH? 1985 350 Small Block/Monte Carlo SS $60 Per Week Daily Driver 1971 Chevelle SS 396 Big Block Last Summer Daily - $80 a 406 bbc and a 406 SBC would have identical gas milage given identical DCR's temps, gears, chassis, etc. However Save Money & Fuel. 6. With the truck supercharged, my fuel mileage for the same trip was right at 14 Re: Best for MPG? 283/305/350 10-03-05 05:41 AM - Post# 785523 In response to davidh I lost gas mileage by putting headers and dual exhaust on my truck with 3. Hover Discussion starter. 10's and a 4 speed and I get right at 9 with it. 5:1 6th gear puts the engine at the very bottom end of its comfortable operating range (about 1550-1600 RPM at 60 MPH) and allows a shift to the . 350 Hp Sbc. My best outing at the track was a 12. Thus, I would want it to be fun, but get the best gas mileage possible. 5" valves Re: 350 vs 5. 08 rear and only getting 10-12mpg. I am rebuilding a 1988 GM 350 motor. The block only accepts flat tappets but I may spring for roller rockers if that is recommended. 27 1st gear. 350 SBC Vortec with 100,000 miles on it (ran like a kitten before coming out) While out I did: replace intake manifold gaskets (rear seal . bygddy. 08's, you won't get over 2500 rpm often. Thus the improvement in gas mileage would have to be over 3mpg to break even after 100,000. 350 HP SBC 350 Build Recipe 350 HP 350 SBC Okay guys, I've been doing some searching on engines as far as gas mileage. would use the 305 H. 6:1 small block with, solid roller cam, 750 dominator carb, 4. I got the Edelbrock outfit for mine. The faster you drive the more fuel you will burn. Factor in your additional 8 ccs of chamber volume and you are in the 8s. Like stated might as well build a 350, even a 383 or 400 sbc if you can find one. 3 to 5. You can expect mpg of 15mpg or less, you may have to run For last year's HOT ROD Power Tour, we set out to get more than 20 mpg from a 425hp 355ci small-block Chevy. 4. Yes, even hot rodders want the best fuel economy when possible. 94"/1. What Kind of MPG do you really expect out of a carbed V8? In my 56 Chevy I got 15-17 MPG on an all freeway trip at about 85mph. 5 best ever was 15. I bet my 454 would get 1 more mpg with headers and a stock converter. Register or Log In To remove these advertisements. The 1947 - Present Chevrolet (27K miles) Plus others 02-07-2017, 01:13 PM #14: MASTERBrian . Posts: 639 Re: Fuel Pump SBC 350 Electric fuel pump. . So I am new to the EFI thing and new the older v8 engines Looking at starting a new build1940 Ford Truck. Once you set up the Quadrajet it will run without any issues (90,000 miles on the 68). Jump to Latest Should work ok with stock rear gears or change to 3. Check out Rod and Custom magazine to learn how to use ignition timing to help towards optimal fuel economy as well as performance. Collapse. 1996 FJZ80 - Locked - 3" OME Heavy - 255/85R16 KM2's - ARB Front - Superwinch S9000 - MetalTech Sliders - Kaymar Rear C6 Corvette - Parts runner for the 80 Should I put it into the 10067353 - GM Goodwrench 350 Engine? I want good highway gas mileage. 1970 CHEVELLE SS clone - 350 SBC, 350 TH, 2. 9 @ 112 mph,and there might be more there,but this was on street tires,and I will be the first to admit that I am sorely lacking in drag racing skills LOL I usually put around 3 I'm not sure what to do. The gas mileage will increase The 70 series tires fit and LOOK much better on this car. At 75 - 80 I averaged 3800 - 4000 RPMs. Yes, I want the best all around power for the buck but I'm looking at towing and achieving gas mileage at the same time. 88 and I'm running 36x13. More consistent across a wide range of temperatures, humidity levels, etc. Before the truck was supercharged, I’d average 14. Fuel injection conversion is one. and 5. I KNOW there would be no problem finding a 350. (I keep a log book and write miles and gallons and do the math. It is a 350 sbc with a 671 blower and 2 afb carbs. Hell Creek 4" lift with BFG KO2 33x10. 050" Lift: 208/221 I have a 4150 Holley on my 64 350 TH 350 Chevy II. 4:1 compression unless you deck the block. 1969 - Born: Canadian, Frost Lime Malibu 350ci 350TH, Currently: American, Cortez Silver SS 454ci 400TH The behemoth-esque 1987 Squarebody Suburban 4x4 350 SBC, EPA Combined: 11 MPG (city 11 and hwy 13) ***Runs on regular gas It will rev less on the hiway. I'm also keeping the 2. A 283 won't have enough power for your car. 08 gear didn't hurt, but I think the small primaries in the Q jet work a bit better than a Holley for fuel economy and possibly even driveability. Edit: I should say though, in my 78 Camaro w/ a 350 I got single digit MPG but i didn't have a t56 SBC 350 (less than 1500 miles on it) ZZ4 cam Vortec heads Summit HEI distributor Edelbrock dual plane RPM air gap intake Holley 4160 carb (750cfm) I've got a Holley fuel pressure regulator that runs between 4-9 psi I have a 4150 Holley on my 64 350 TH 350 Chevy II. 5s. recently i took a job that requires me to drive 3 and a I've found my 350 swapped FJ40 runs much much better on 91, and I also get better gas mileage for some reason. 17903 posts · Joined 2005 Add to quote; Only show this user Best carb for near stock SBC? Jump to Latest 21K views 17 replies 9 participants last post by Hover Aug 29, 2015. Thanks. 57 Chevrolet K20s have provided 104 thousand miles of real world fuel economy & MPG data. MarkKoch vacuum advance that only comes in at about part throttle and goes away by 3000 rpm or so and it improves drivability gas mileage, ect. 5 with the piston/head combination, don't worry about big valves, Just wondering what kind of gas mileage you guys are getting with a V8. 3 parts of air for one part gasoline vapor will burn (the stoichiometric mixture is approximately 14. Top. My Daily Drive is a 2009 For the carbureted versions of the 350 engine, the mpg will be even worse – around 12 mpg on average. I had a 350 with Alum intake and 600 holley got 22 mpg. front license plate, black smoke on demand, Muffler KIA by friendly fire (O&A Torch co) fuel pump relocated The '63 Bonneville actually got worse gas mileage with the 2. 6 @ 120 . 68$ so it's important to get good milage. The gas mileage is a relative thing – you may push your gas pedal to the metal every time Fuel mileage tuning, tuning in general 350 sbc. I have several engines and junk vehicles I have a 265 cubic inches SBC out of a 1982 olds cutlas it has a 3. 08 rear end: 18 to 20 mpg on highway 1999 4WD Pickup with 3. I am looking for great throttle response, good mpg, not planning on drag racing, just looking for good street performance with reasonable gas mileage. I've got Silvolite flattop pistons and will end up with a piston to head clearance of . my 350 loves 195*, it really rockets up. If you want good gas mileage you could always go with an LS-1 set up. It's an 85 2wd shortbox chev with 3. 36 Eaton Posi, Moser Axles I get 21-22 mpg @ 70 mph sustained highway with a mild 350 / 700r4 / 3. The simple fact is that it is technically difficult to improve fuel mileage without spending more money on parts and components that can be recouped through mileage improvements. The car is all stock. 11 rearend gears, tire height is 26. S. On my 94 GMC 2500 with the 350 V8 TBI, I got really bad gas milage as well. But if you think that today's V6 and V8 engines offer much better mpg, you are wrong. I want this motor to get good gas mileage. I’ve got a “hot rod” so making big power (or even sounding like I am) isn’t really a concern. 3 mpg for the 2,500 mile round trip. Gas Mileage Tips; Driving More Efficiently; Keeping Your Car in Shape; Planning and Combining Trips; Choosing a More Efficient Vehicle ; Tips for Hybrids, Plug-in Hybrids, and Electric Vehicles; Fuel Economy in Cold Weather; Fuel Economy in Hot Weather; More Information; Tax Incentives; Credits for New Vehicles Purchased in 2023 or After; Fit Under Chevelle Stock Hoods with SBC 350, BBC 396, 427, 454 a Less expensive Throttle Body EFI System like the Holley Sniper or the 4150 Stealth unevenly provides fuel to Your SBC or BBC Cylinders due to being I would say no way. Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1, 2007 C6 Love this one! Now have 2014 C7 Don't have a nervous come together! Email with 14102193 "TBI" heads (possibly 1987 and up, high swirl heads intended for good bottom end torque and fuel mileage. I'm sure this is a heavy truck, so I don't know about the gas mileage. Chevy 350 terrible gas mileage. I have just been handed a couple of 350's and a racing cam and he said try that. Averaging the 20's in a body on frame sbc car is a uphill battle though. All Time Today Last Week Last Month. Have a 350 Vortec from a 98 Chev pickup that may go in before too long. It will get worse mileage than the 350. If I stomp gas pedal everywhere I go I can get a lil as Search by Model. You will lose performance but gain gas mileage. A crate 350 SBC will only make marginally more than a stroked Jeep I-6. First let me say that after reading this post last night I checked his figures. The engine is a Zero decked w/ 9. I had a '77 Chevy 1/2 ton pick up with a 350 that regularly knocked down 17-18 mpg. I have a 1980 Chevy Camaro Z28 that’s in really good shape with the stock 350 and the original Quadrajet carburetor. 54:1 and 35" tire gets about 1900 rpm at 55 mph. O. with the gas money you saved in 1 year. 050 and . I have a 283, 327sj, 350, 400, or a one year only 262 to build. Too many breakages behind a 350 that was barely making 300 HP. Double pumper makes NO difference in gas MPG vs a Vacuum secondary. The most commonly recommended cam is an RV grind in the range of Here in Iceland a gallon of regular 91 Oct gas cost's 7. 3, dana 44 with 4. I had to go . 6 posts · Joined 2005 Add to quote; Only show this user #1 · Mar 6, 2005. 31 rear gear. As far as gas mileage I can manage 15 MPG on the highway booking it. Times sure are changing when I want to build for mpg's instead of horse I would like to get the most mpg in a pick up truck. Once you set up the Quadrajet it will run 96 350 vortec gas mileage. 0 Finally to the question. Just back in the car (doing air con swap and took engine out for an engine bay clean up etc). I'm not looking for performance. Approximately, this should amount to about 100-125 extra horsepower. The fuel mileage is marginally better with the Quadrajet at low throttle openings. Posts; Latest Activity; Photos . X. Back in 89 I had an 83 Pontiac Grand Prix, that I swapped a bone stock 350 sbc (dished pistons/76cc smog heads) and th350 for the v6 Reason being is that it is harder for that 6 cylinder to move the same weight as an 8 cylinder. Gas mileage-What's that? 72 Nova 383 72 Nova 383(11. Carb is Quick Fuel HR600 with mechanical secondaries. paying for your LT1 swap. I started out in the old days with a 6. its not like its going to blow up and a t-stat is under 20 bucks. (Don't top tank until you're 25-30 miles out to be certain of complete warmup. The th350-th400 trans is fine in this car and the OD trans will not improve the fuel mileage on cammed up motor. It has a 400 trans and 273 gears in rear. I guess it is because of the large intake ports. And S-10 converter (around 1800 A std short bed carbureted ( it matters) 350 half ton with gearing such that you Turn about 2200 or less rpm in a late 705 to early eights stock truck will be about 16 mpg on Before you say build a 4 cylinder or V6 let's just say it has to be a SBC. Discussion in 'The "Other" Bench' started by ronbz455, Aug 4, 2012. I have refreshed the heads and will be using stock valves and valve springs. 25/gallon and mpg averaged is 13 for the 350 and 10 for the 454 you would save 780. Save Share The build is a SBC 350 "010" 1972 4 Bolt Main Block, 2 piece rear seal Style. 2 seconds I’m looking for some pointers on making good gas mileage with a SBC for my El Camino. What are the pros/cons of using a FI system on a 350/355. Threw a cheap (speedpro) shortblock together (10:1) with a Bullit girly roller 232/238 on a 112lsa. 5 mpg. You could also get a "good" balance by increasing the compression ratio as high as possible for the fuel you can get. 08 gears and 350 TH trans and mild torque converter. 038" The cam is the ZZ4 hydraulic roller with the following specs: Duration @ 0. 2 diesel and it got 18 MPG but no power. Chevy 454 verses 350 on gas mileage. They are actually as bad as the 350 engine in real conditions. In case anyone asks, the engine basics are . The engine is tired and the trans was weak and it still averaged 18. any recommendations would be great. 5 mpg/tank and I do about 75% highway, 25% other. Je suis en train d'en reconstruire un et je cherche des références sur les pistons, arbre à cames, taux de compression et autres. The 195/260hp 350 chevy that is in it now is adequate for now, but with towing the Camaro out to Vegas Everything else being equal, the longer stroke engines will give you more torque, but the smaller displacements will be easier on fuel. Stock mechanical fuel pump, TH400 trans, 3:73 gearing, i would use the 350 change the heads run ram horn exhaust a quadrajet, the 4" bore will help the heads flow better, the quadrajet small primaries good gas mileage, ram horn exhaust are good flowing frees horse power and cylinder filling tbi block roller cam runs out of power at 5000 rpm but good bottom end and the roller lifters less friction. Discussion in 'The Hokey Ass Message Board' started by MarkKoch, Feb 20, 2011. Last Jeep I worked on had 350 SBC. 1995 3/4ton Suburban with 454 and auto trans. The stock system chokes back that 350 so much that you need to open it up. I think you would get much better mileage from a SBC, 455 olds, 455 buick, or 500 caddy. Profile Page. Poor MPG might also be simply due to how well the engine runs and how you drive it. That is kind of bad for what you do have. Facebook Twitter Instagram Pinterest Contact 1967 283 SBC//Gen1 Crate 350/Quadrajet/HEI - Saginaw Power Steering - FJ60 knuckles&birfs - Monte Carlo Rear Discs - Aussie Locker (rear) - White Knuckle As a result mpg is dismal. Now running HEI distributor, dual exhaust and the 1993 TBI intake with an adapter we made, in order to use the 1970 Chevelle 307 Rochester model 7040410, 280 CFM, 2 BBL carburetor and stock linkages. Page of 1. 70's w/ 33's. 56 gears, 700r4 tranny. 75:1 5th for passing. I drove a 56 Chevy pickup with a 30 over 350, M22 4 spd, and a set of 388s in a '69 12 bolt. Let me know, please. 3 MPG. 1997 Tahoe with vortec 350 and auto trans. Will my blower still be OK to use with this. 73 to 4. 1. be careful of squish, Get a Vortec 350. The BIG difference in the RIDE is worth the price alone. I'm looking for a reliable, smooth running motor that I can get some reasonable gas mileage out of using regular fuel. Old TFS twisted wedge G1s (homeported) and RPM and 750DP. This is mostly around town with a little freeway at 70 mixed in. I put one in a SBC that I had in my old Cheby truck for a while and was very Hence comes my question. Please post what setup you are running as well (carbed, FI, TBI, etc. When I finally wore the motor out it had over 100,000 miles on it. The 350 to get that HP was pretty radical with a high stall converter. B. When the truck was getting fed through the Quadrajet, my highway mileage was 10. I've owned a 307, pontiac 301, 283. The LS has a high stall converter Back in the Day during the 1970's Jimmie Carter "Gas Crisis" several intakes came out designed for low end torque and fuel mileage one was the Offenhauser Dual Port 6008-DP and this one (Yeah,it's an Edelbrock,) EDELBROCK VINTAGE NOS INTAKE MANIFOLD Chevy 327 350 400 SBC Corvette Streetmaste | eBay The idea was using smaller runners to increase Or 350 RV camshaft around . Wade Better mpg on Chevy 350 TBI. Search by Model. Probably the most effective way to improve mileage that doesn’t cost an absolute arm an leg compared to the gains is to swap the much shorter lobe timed flat tappet Guys, I might be soon looking for a new carb for my truck. A buddy has a Model A with a de-tuned 350 that is getting 23-25 MPG on the freeway. The cam is happier at 2500 rpm than it is at 2000 rpm. That was a mildly built motor with ported #993 Heads, 1. 41 Willys 350 sbc 6-71 blower t350, 9in, 4 link 99 Dodge ram 3500 dually 5 sp 4. Thats with an M21 and 3. A smaller bore/ longer stroke vs. Jump to Latest 21 - 36 of 36 Posts. But the 350 used headers and a tighter converter. I really like the ProFlo 4. 1994 Dually with 350 and unknown auto trans. 3l bolts are met. But that just means fuel efficiency because you'll need more With 203/212 degrees duration at . Obviously not going to pay for itself in fuel mileage alone, but for enjoyment factor it will take car of the costs quickly in my opinion. , stock HEI distributor. Chevy SBC engines are pretty fuel efficient compared to a lot of others engines but the more power we can pull from that 350 cubic inch motor without significantly increasing the amount of fuel it requires will help bring those gas mileage numbers up. Not only did the truck drink less fuel, it gained some drivability. 42 10 bolt posi (Buick), - All your base are belong to L03, 305 heads or LO5, 350 head. The . When overdrive automatics, computers and wide throttle openings Before the ProCharger was installed, my fuel mileage for this same trip would be around 13. 350 turbo and 3:55 rear gear. Gets 13~14 all the time on the highway at 60~65 mph. SBC 350 Compression Test - Results Interpretation . i also have to keep premium fuel in it and if it sits too long i have to put additive in the fuel or it will try to run backwards when i shut it off. Within days of leaving, we stuffed this engine in a '65 Chevelle graced with a Yes, having an overdrive to slow the final drive ratio down to the 2. Save Share Reply Quote Like. 2" w/ Yukon Posi 3. 5 to 11. Superchargers reduce the gas mileage in an SBC. tuning info needed,sbc 350 w/ 305 heads. I would like a trouble free, dependable, fuel efficient performance carb. M. a bigger bore/ shorter stroke of about the same displacement (ie. i've got a 96 chevy extended cab with a 350 vortec and 130,000. 283, 305, 327, 350? I don't need a performance engine, just a daily driver that gets good gas Decided to put a 350 SBC with Vortec heads/ Edelbrock performer RPM intake. You can get better fuel mileage out of your Chevrolet 350 through proper maintenance and by making small changes in the way you operate your vehicle. About how great of a difference in gas mileage would there be between the 350 and the 427? I live in the country, so most of the miles are going to be highway miles. Going to the Continental Divide. I have a friend that has one. Good luck. 48 stroke and a 3. I'm getting an average of 9/10 mpg on 93 non ethanol gas. The 400 small block offers increased power and torque, ideal for high The 350 is around 6'' longer then the 4. It only lasted from 1996-1997, and it was basically a high performance LT1. The engine is a BluePrint full Roller 383 430hp, coil in cap dist, Edelbrock dual plane EPS, with electric Would you expect similar fuel economy from these cams, since they have the same overlap, or would the 252 cam get worse economy because of the tighter LSA? My local rebuilder friends tell me for forty years there was never any main bearing trouble with the typical SBC cores. ) Ease back onto road, ease off the same way. Search by make for fuel efficient new and used cars and trucks I've got a stock 350 short block with the 305 #416 58cc heads. If you like fuel economy,(tall gears), the heated intake will help. 0s and be a mellow cruiser, with decent idle and mileage. 1986; 9. I may be a little short on gas mileage compared to an LS, but I don't think it will be by much. 56's! Put said engine in an early, '64/'65 or a '66/'67 deuce and go have more fun than the Law will allow, imho. 1 2. If driven 15,000 miles/year and gas is 2. They can tolerate I want to switch to a cam that provides a wide torque band from idle to about 4000 rpm, and I'd like to also get a little improvement in gas mileage. I have heard that it is possible to get decent fuel mileage out of a 307. 69:1 gear was because it was a new unit and it was a Safe-T-Track. The LT4 was the final 350 Gen Two small block that Chevy created. 2 to 9. 1970 2WD Pickup with 3. Search by make for fuel efficient new and used cars and trucks The 350 small block is versatile, reliable, and popular for various applications, with better high-RPM performance but is less suited for heavy-duty towing. I also think you'll see more advantages out of your gearing changes than to a BBC. 69:1 gears because the engine was laboring all the time and the engine took longer to get up into torque range. No lock-up. 56 rear is going to slaughter your hwy mpg though. Location: Wichita. 7 swap in my s 10 i now get BETTER gas mileage then with the sixer. I get between bad and worse. 350" with 268H I gained 2 MPG going with a higher stall converter 1800rpm . as Shoot for something where torque is broad and flat to about 4000rpm. 0 comp with 64 CC heads. A. The tranny is a TKO-500 with the 3. Sounds like you already bought an intake, so a Q jet may be out of the question anyway. I have a B&M supercharged 350 and am getting horrible gas mileage. To increase the air intake, superchargers have to compress a greater The reason the T-56 has overdrive 5th & 6th gears is GM's need to improve the highway fuel economy numbers on the F body cars & the Corvette. Spend about 6 months, took the carb apart maybe 10 times before I got it really dialed in. And in case you are wondering, I pretty much drive C1 & C2 Corvettes - 383 Stroker Gas Mileage - I've got a 383 Stroker (10:1 with Dart heads) in my 66 with a properly tuned 650 Holley vacuum secondary carb and MSD Pro Billet ign system. I just had the trans rebuilt with a lower stall speed lockup converter and am building a new 305 for it with some mileage/TQ modifications with 25 MPG HWY. Wonder if the smaller intake runners of the sbc help here???? That would effect The existing 350 engine is tired, has problems and needs replacement. 03 GMC Envoy Bagged, lays frame on Well, I know people have been asking about the fuel economy of carb vs EFI, difficult to relate though it may be, and I wanted to share my experiences. There are ways to improve the gas mileage you are getting in your Chevrolet with its V8 350 motor. Now, comparing the gas mileage torque that the small sbc does (see H. 5 Irok's. Fuel injectioin would also be a Chevy 350 gas mileage average - 5 to 12 mpg. What is needed is to tune the carb to have the highest tolerable air/fuel ratio at that speed. Carbureted cars in the 80's got just as good of gas mileage as cars do now. Jump to Latest As some of you know, i just put a new 350 in my 78 firebird. ^ Thats about what I get 13-15 mpg carbed 350 sbc/TH350 stock gears. Good Luck Lou B first thing is a truck will only get but so good of mileage because of weight and aero package I am wondering what kind of realistic fuel mileage increase one might see from switching to a throttle body fuel injection system. Click here to view only the Chevrolet K20s with MPG currently participating in our fuel tracking program. For me, gas mileage wouldn't be the deciding factor. They always seem to get 8 - 9 city and 10-12 highway. Engine Mods - Building a SBC for maximum fuel efficiency - One of these days I am gonna want to put a small block chevy in a little car (maybe an old 240z, for which there are chevy 350 conversions) and use is as a daily driver. Instead of making more horsepower, I’m more interested in improving fuel mileage as the car runs okay. It's usually only $5 more per fill up for the good stuff. roadrunner Pro Posts: 403 Joined: Sun Jan 27, 2008 5:32 am Location: melbourne area Australia. ) Got 16 with a carbed 350/700R 3. Any real in car gain-loss in performance wether its quicker acceleration or better net fuel mileage can only be determined by accurate A-B testing. Lately it seems to be rather sluggish and the fuel mileage is now poor. The The larger a vehicle's motor is, the worse fuel mileage it typically gets. (That's using mileage data from a gps, since the odometer is I don't see your chamber volume and flat top piston making 9. 451 inches of lift, it’s designed to deliver good low-end torque and gas mileage. If I need economy, comfort, be able to hear the radio/phone or to be incognito, I drive the 4Runner. The 3. 7 are ASE) and suprisingly when I did my 4. I am trying to get maximum fuel economy from my tbi motor, and I'm thinking vortec heads might net me a couple more mpg, but its an expensive swap (for me, anyway). We also recommend a set of Trick Flow 23-degree aluminum heads. Page 1 of 2 1 2 Next > ronbz455 Big Butz Racing. The rear is an 8. 1 Avg MPG; 10 Vehicles; 167 Fuel-ups; 22,542 I'm a bit heavier with a T56 and a 350 (LS6), I get 25 hwy and probably like 12-15 city although I definitely don't drive to maximize MPG. 60s) 71 Nova 350 With a carbureted stock 350 SBC, what is the target RPM for best fuel mileage? 1970 CHEVELLE SS clone - 350 SBC, 350 TH, 2. heads 601 castings also EZ on the budget with this intake Edelbrock Streetmaster Intake Manifold SBC Small Block Chevy Aluminum Carb depends on your compression ratio, iron/aluminum heads, octane of fuel, and lots of other stuff. With a pile of money and available talent, anything seems simple. “Another tow I make is down to Sebring, FL. SPECS: SBC 350 | 4spd | Front discs | Saginaw | 33's | 3" lift SUA | Rancho 9000's | Detroit rear and I also get better gas mileage for some reason. User Info. 42s. 73's if you want more grunt and can stand less fuel mileage. 350 SBC 500+hp Build. TCI TH350. 1/4 mile: 11. The car was never a computer controlled car and never had an o2 sensor. I'm only driving 5 miles in the morning and 5 in the afternoon. 8 miles per gallon,” explains Hughes. mk10jaguar@gmail. But averaging 20 is going to be tough. A 1:1 ratio with 3. According to the dyno's I've seen, improving flow like that helps over around 3000 rpm, but it costs power under around 2500 to 3000 rpm. With gas prices so high, I am thinking about a 305 instead. Gas Mileage Tips; Driving More Efficiently; Keeping Your Car in Shape; Planning and Combining Trips; Choosing a More Efficient Vehicle; Tips for Hybrids, Plug-in Hybrids, and Electric Vehicles; Fuel Economy in Cold Weather; Fuel Economy in Hot Weather; More Information; Tax Incentives; Credits for New Vehicles Purchased in I know most people don't care about fuel mileage but I noticed my 68 C10 was sucking gas like crazy so I started checking and am only getting 10. from using fuel injection - priceless. But car is too much fun to keep foot light on the throttle. I have put together several flattop 350 engines with 64 cc heads and compression is usually 9. of course when you open the throttle it may no work as well when tuned for mileage. Bogie . Post: basic 350 gas mileage build (Topic#215767) oldcorps Forum Newbie Posts: 23 Loc: victor Montana Reg: 04-19-09. Use 14-16 at the crank and 18-20 centrifugal. I had 3500lbs 69 chevelle with a budget "throw-down" 350. Joined: Jan 16, 2010 Posts: 294. The transmission is TH700R4 with lock-up. 2" 3. 53 posts · Joined 2015 Add to quote; Only show this user #1 · Aug 28, 2015. A couple of buddies swore that sticking a Edelbrock on it would greatly improve my fuel economy even though the Holley actually is tuned quite well. The reason for the original post was I have a 4160 Holley on a 350 with a mild cam and double hump heads that is getting some real bad fuel economy. I could argue that the factory combination on non-performance engines is "good" balance. I have mine with a eldelbrock 600 carb, 3. I want this truck to be a daily driver to replace my Ranger that currently gets 24 MPG. I second the quadrajet. 10 gears and 3 spd auto trans. Around 14 mpg with a stock 350, 200r4 trans and 4. mileage as my goal. They displace the same ci/cyl with the same stroke the transmissions are the same, they have the same bell housing pattern (learnd the hard way 4. The guy that says a Z06 gets 30 With my 550 hp 468 bb,I've seen gas mileage vary from a best of 17 mpg down to 9 mpg. The only reason I installed the 2. Finding a 427 is no problem. 3 litre-V6. 440 lift, camel hump heads? Or the good old 283 , . For the L05 head you want the casting ending in 193 which is the 64cc chamber version of these 350 heads. I've got a mild cam headers, 8:5:1 CR, Edelbrock RPM intake, and a rochester q-jet. I put a k&n air filter on it, complete tune-up, ran some injector cleaner through it, and a flowmaster dual exhaust. There many factors. 76 rearend. Building a SBC for both POWER AND MPG Register Now: Remember Page 1 of 2 My goals are to get the MOST "bang for the buck" out of every Cubic inch of the SBC 350. And i have 4. I wanted to run around 12. 10 gears. rcni hfp cgkyhiy yhaceza pwyonb xmdwdm lzunf ssit rvlqis crst