305 Vs 350 Gas Mileage

A TPI engien gets better MPG by 2-3 so a 350 TPI.

305 vs 350 gas mileage. I would always get 17.5 to 18 mpg city or highway, maybe because It didn't have an OD. You can't get 3ci out of it because the stroke of the 305 is much longer than a 350. 350 mileage, performance, reliability C/K Car Forums Page 305 305 vs.

What type of difference would I be getting from a 454 or a 350 in gas mileage. 350 mileage, performance, reliability - Page 305 - Car Forums and Automotive Chat Our Community is 740,000 Strong. It had great low end and still did 1 on the top end.

I going for gas mileage on my Chevy pickup. MerCruiser 3.0 MPI/TKS - 181 cid. Should I rebuild the stock 305 or a 350ci.

I might consider the V-10. I had an Silverado with 305, automatic with lockup converter, and 3.42 gearing. 350, well my uncle had a couple 305s (one was a 95, one was a 96), and they both got bad gas mileage when compared to a 350, and of course had nowhere near the power as the 350 (even the Vortec 305s are rated with more HP then my TBI 350, but I have drove a Vortec 305 before and it doesn'teven compare to my TBI 350).

Chevrolet 305 and 350 cubic-inch engines are virtually identical, differing only in cylinder bore size. May 27 11, 10:51pm. What the the difference between a 305 and a 350 Chevy engines.

The 3/4 ton 350/4-speed trucks I've been around returned fuel economies in the teens stock with no special tuning. 1980s Chevy truck with 350 will mean a 3/4 ton truck. Westech selected Comp Cam's dual-pattern XE262H-10 Xtreme Energy hydraulic flat-tappet profile.

MerCruiser 4.3 TKS - 262 cid. 6.7 gals/100 miles. Boat-Fuel-Economy | Sea Ray Fuel Consumption | US Gallons, Imp.

Both V6 and V8 versions of the 305 engine have been produced, so it really depends on the engine’s manufacturer and model year. See all 14 photos. Your vehicle usually has the best gas mileage at around 60 mph.

Tpe 305 I had a 305 TPI in my 65 Impala SS with 13 inch wire wheels, yes I was into lowriders. Cam, intake, headers and carb will wake it up big time. It will still cost you in the vecinity of $3500-$4000 to build a good hp engine.

They don't put out the hp of the big brother but they'll keep up with them and get decent mpg too. Not sure what the gear ratio was and it had a turbo 350. Fuel economy is rated at mpg city, 27 mpg highway and 23 mph combined.

I put over 50K miles on my truck last year alone. How can I share my MPG?. Coverage and cam followers that wear out and get noisy and expensive.I like my pushrod engines better.Slightly better mpg,good power and less to worry about,imho.I am on,and have been on for many years F**d's x-plan.basically it's like employee discounts,and I drive a chevy.What does.

The most accurate Ford F-350 Super Du1ies MPG estimates based on real world results of 263 thousand miles driven in 36 Ford F-350 Super Du1ies. Will beat most 350's around here. The 305 engine is much-maligned and shunned as a performance build, mainly due to its small bore diameter of 3.736" which limits breathing.

Say 35's, 4:10's, but is a 454 going to get alot worse gas mileage or 454 vs 350 gas mileage - Off-Road Forums & Discussion Groups. So i'd say take the 305 if it was free and use that while you build up a 350. If I had a beefier I/O I'd throw a 350 or 3 in there in a heartbeat.

From , the LB9 was offered in. Honestly a 305 would work really well in this application, great low end torque and small bore for less fuel consumption. The 305 is working a little harder than a 350 would to pull it with those gears but when I tried running in Drive instead I lost 2 MPG.

But my vortec 350 in my yukon gets up a little faster then my friends old z71 with vortec 305. 305's get better mileage also. The 305’s bore was even smaller than the 3.75 inch bore of the 1955-1957 265 CID V8 which was the first small-block Chevrolet V8.

Inspired by the popular Chevy 350, the 305 had a more narrow bore and was placed in many wide-bodied GM model cars. Especially on the larger L98 350 engine. Chevy 350 with Edelbrock 650 carb - $1,000 Lt1 gas mileage average - 15 to mpg Chevy 350 gas mileage average - 5 to 12 mpg paying for your LT1 swap.

As I recall, from to about 86 or 87, the 1/2 ton Chevy/GMC could only be had with a 305. 305's can be solid engines and run well but if given the option I'd always choose the 350 over the 305 if building from the ground up. Im going with a 305, my 2.8 just isnt cutting it, but i dont want crazy power, or schitty gas mileage.

The 327 has a 4.00 bore, same as a 350, you can't bore a 305 out that far. My personal car with 305 automatic and 3.42 gears with most of the mods listed got 26-27 on the highway. Only reason I'm hot rodding a 305 is to keep the tq to a minimum to save the I/O.

Owner MPG Estimates 1997 Chevrolet C1500 Pickup 2WD 6 cyl, 4.3 L, Automatic 4-spd Regular Gasoline:. I'm getting around to putting my 75 camaro lt type on the road and was wondering what my gas mileage might be. Back in the 80's a friend had the Holley economaster on a 350 Camaro.

Limited breathing limits naturally aspirated power potential. In town however gas mileage is directly affected by the lead foot attached to the go pedal. My truck gets 10 to13 mpg towing, depending on weight.

The heads on a 305 have a cc of around 57-59, which would raise the compression too high on pistons from a 350. Any Engine Type 4.1L L6 GAS (1) 5.0L V8 GAS (1) 5.7L V8 GAS (6) 6.2L V8 DIESEL (6) 6.6L V8 GAS (1) V6 GAS (1) V8 DIESEL (4) V8 GAS (6) Any Body Style. Gallons & Liters per hour | Models :.

There are still plenty of them out there and some are bargains. Send it to a machine shop and have them bore the cylinders 0.030-inch over. The chambers are much smaller than old 350 "emissions" heads- 76cc vs.

All depends on how much driving you do. 5.3 vs 350 vortec. Use the motor mounts that are on the 305.

I got 21 mpg and could fry the tires. If you can keep the 305 from struggling (not an easy task in such a big pickup) then it will do alright, but in my experience a 350 will get better mileage 80% of the time in these heavy trucks. The main journals in a 305 are a different size, so the crank isn't bolt in, but it can be modified to fit.

The small-block Chevrolet 302, 327, and 350 CID V8s all share the same large bore of 4.000 inches. As for teh 305 vs. The advantage of a large bore is it makes much better use of high performance cylinder heads.

You will be able to find a 305 much cheaper than a 350 due to demand. In practice, there seems little real advantage in gas mileage over the 350, but you may get less costly insurance rates. The "correct" cam for a 2 will be smaller than a 350, also helping mpg.

Well, basically, what SgtDel said is the key. While the 305 drew the unfortunate lot of playing second banana to its 350-cubic inch brother, it's still capable of delivering excellent efficiency and street performance belied by its humble output figures. However I'm talking 18ft boats.

EPA MPG Owner MPG Estimates 1990 Chevrolet Twin-Turbo Corvette 8 cyl, 5.7 L, Manual 6-spd Premium Gasoline:. There is a guy near me with a 335 in his IROC and the car screws. I'd go with the 7.3.

If power is your priority I would go with a 350 ci. The RX 450h also uses a 3.5-liter V6, but it combines the internal combustion engine with an electric motor to offer 308. Trucks had taller mounts than cars did, easy to change.

Begin with any 1980s 305 engine. 6.3 gals/100 miles. They quit putting in the 305 before they came out with the throttle body injected 350, A carbureted 305 will not get mileage different enough from a carbureted 350 to merit a switch.

The Chevrolet Camaro, Caprice, Malibu, El Camino and Monte Carlo implemented the 305. Is a 305 engine a V6 or V8?. Bounce this off a cam guru or Vizard wannabe, but as far as the combination goes.

I'm building the 355 for maximim TQ from an idle through 4,000. Of torque) and the available 7.3L V8 economy-tuned engine calibration (300 horsepower and 425 lbs.-ft. As a comparison my 81z with a 350 with a 3.08 rear gets about 13-14 around town.

To identify any Chevrolet small-block V-8 engine, the engine ID number must be matched to a listing of suffix codes, which identifies the details of the engine in question, including original application, horsepower, year of manufacture and technical specifications. Properly tuned you shouldn’t get less than 23 mpg on the highway with cruise set (no lead footing). And there's really only so far you can go with installing bigger valve before you have shrouding issues with the small chambers.

I have been running an impco 425 cfm for the last 25 yrs, and still run hi 13s/low 14s on 350 turbo/308 rear. If mpg and budget are of more concern I would go with the 305 ci. Joined Aug 5,.

But if you want to build a 305 go for it. Sundancer 230 - 240 - 250 - 255 - 260 - 265 - 270 - 280 - 290 - 300 - 305 - 310 - 3 - 330 - 340 - 350 - 355 - 370 - 390 - 410 - 4 - 450 - 460 - 470 - 500 - Sedan Bridge | mpg calculator - Sport 190 - 5 - SLX 210 - 230 - 250 - 270 - 300 - Sundeck 2 - 240 - 260 - 280 - Bow Rider 160 - 175. A properly built 350 should get pretty close to the same MPG as the 305 with maybe marginal differences.

A 305 has 45 less cubic inches than a 350, so it requires conservative camshaft selection. An overdrive trans would also be worth the extra money spent for sure. Still gets 25 with the 450hp 3.

Remember looking for the best mileage. Yours is a 26ft so the 350 is a no brainer. The bore was increased from 60 to 64mm, the stroke reduced from 54 to 50.6mm, the true size of the “new” engine being only 325cc.

Opt for a slightly higher compression 2 if milage is a concern. If it's a plain 305 I wouldn't bother with it BUT if it's a HO 305 it will make the 350 lovers eat crow. View Estimates How can I share my MPG?.

Don't know what the gas mileage was though. The Chevrolet small-block engine is a series of V8 automobile engines used in normal production by the Chevrolet division of General Motors between 1954 and 03, using the same basic engine block.Referred to as a "small-block" for its comparative size relative to the physically much larger Chevrolet big-block engines, the family spanned from 262 cu in (4.3 L) to 400 cu in (6.6 L) in displacement. GM introduced the Chevrolet 305 engine in 1976 to provide a smooth driving performance while allowing for lower octane fuels and lower emissions.

The Ford TorqShift ® six-speed automatic transmission is designed and built by Ford to handle the high-performance demands of the standard 7.3L V8 Premium (350 horsepower and 468 lbs.-ft. It's basically stock I've got a rochester quadrajet, stock intake nothing special and of course headers. Having a different number would be good, from 305 to 350.

Unfotunately 305 heads only came with 1.84" intake valves maximum with many earlier ones being only a 1.72" valve. I have a gm crate 305 that is around a 1985. You will also get worse gas mileage if you are driving up-hill, on uneven terrain, or on a curvy road.

You will be much happier with the TPI, better mpg, awesome throttle response. As for putting a 350 in place of a 305, that's all there is to it. And his was a rcsb with 3:73's and 285s, the yukon has 3:42's and 265s '96 Yukon Eagle - Nitto - Panasonic - Kenwood - True Dual Super 44's dumped before axle - Cat Delete - K&N Drop In - Black Bear - 2" Crank.

My big boat 92 Caprice with a TBI roller cammed 350, 700r4, 3.42 gears and 28" tall tires got the same average gas mileage as my 86 Caprice with a 4 barrel flat tappet 305, 700r4, 2.56 gears, and 27" tall tires. Click here to view all the Chevrolet K5 Blazers currently participating in our fuel tracking program. What the the difference between a 305 and a 350 Chevy engines.

Both very close the 305 might get 1-1.5mpg more than the 350. I used an external fuel pump and a painless wiring harness with the stock ECM. It will hit peak TQ around 1800, cruise RPM at 55 MPH in OD is about 1350.

I just want to be able to get out of my own way when im pullin onto highways. 26 Chevrolet K5 Blazers have provided 72 thousand miles of real world fuel economy & MPG data. With the gas money you saved in 1 year.

Also you should looka t if the engines are carburated or tuned port injected (TPI). I know a guy who went from a 305 to a 350 and he said his gas mileage plummitted.