305 Vs 350 Mpg

Well, basically, what SgtDel said is the key.

305 vs 350 mpg. Also the 350 is a much better engine if you decide to start adding performance upgrades, the power potential of a 305 is seriously limited by the small bore size. I have a gm crate 305 that is around a 1985. Chevrolet 305 and 350 cubic-inch engines are virtually identical, differing only in cylinder bore size.

A TPI engien gets better MPG by 2-3 so a 350 TPI. 4.000), not quite the power or torque, but durability should be almost identical. 367-mile extended range based on 42 MPG combined city/highway (gas).

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. Little quarter mile run back in the summer. If you can get a good deal on a 305 go with it the only difference like someone said earlier is the bore size the only part the would not interchange between the two is the pistons and rings literally everything else will bolt up between the two.

As I recall, from to about 86 or 87, the 1/2 ton Chevy/GMC could only be had with a 305. A properly built 350 should get pretty close to the same MPG as the 305 with maybe marginal differences. Over 2400 will make more power but gas mileage will suffer.

A TPI engien gets better MPG by 2-3 so a 350 TPI. I just want to be able to get out of my own way when im pullin onto highways. I'm building the 355 for maximim TQ from an idle through 4,000.

If you have a specific 305 vs 350 let me know and I'll give you the HP numbers. Joined Aug 5, 04 ·. MerCruiser 4.3 TKS - 262 cid.

How can I share my MPG?. The 1985 305 TPI engines used ECM, which is the same as the 1985 350 TPI ECM (350 was only available on the Corvette in 1985). Inspired by the popular Chevy 350, the 305 had a more narrow bore and was placed in many wide-bodied GM model cars.

I have owned an old school 305 powered CJ-5 with alot of extra weight etc. 350 are basically the same engine. Mpg seems a bit optimistic for either V8 configuration.

Dont feel bad -i get 10 mpg from my 93 1500 with 305 while towing and its bone stock. Exhaust notes from a 19 305 el camino and a 1990 350 silverado. Jump to Latest Follow.

Having a different number would be good, from 305 to 350. Search by make for fuel efficient new and used cars and trucks. Just realized that the above HP ratings were printed from my GM truck book 1973-19.

Both very close the 305 might get 1-1.5mpg more than the 350. The dual feel inlet model provides a precise intake you need to reach 750 CFM and you can use it in both modified and stock vehicles. Also you should looka t if the engines are carburated or tuned port injected (TPI).

All depends on how much driving you do. Now if you have a 3 or 350 with at least a level 5 camshaft then you may need. Also, post the casting number if you can.

It is an extremely rugged and durable engine, and some of the design characteristics of the Buick 350 are found in modern GM engines such as the 231 V6, and Series I, II, and III 3800 V6's. A 305 has 45 less cubic inches than a 350, so it requires conservative camshaft selection. The 3/4 ton 350/4-speed trucks I've been around returned fuel economies in the teens stock with no special tuning.

The small-block Chevrolet 302, 327, and 350 CID V8s all share the same large bore of 4.000 inches. You will be able to find a 305 much cheaper than a 350 due to demand. Using modern era HP ratings the 305 was rated at 130-170 HP and the 350 was rated at 160-210 HP.

I like the EFI, and the 700r4. Alot depends on how the motor was equipped such as carbed, injected, from CA, and so on. It's basically stock I've got a rochester quadrajet, stock intake nothing special and of course headers.

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. Most of you if you have a 350 and you go to a mild 350 upgrade will be fine with a stock 350 PCV valve. Most Popular 305/55-R Comparisons.

The most accurate Ford F-350 Super Du1ies MPG estimates based on real world results of 359 thousand miles driven in 45 Ford F-350 Super Du1ies. Westech selected Comp Cam's dual-pattern XE262H-10 Xtreme Energy hydraulic flat-tappet profile. The 305 was built buy Chevy to help them get buy the Fed gas mileage requirements that started in the 70's and all they.

Problem number two with the 305. If you have to put a bunch of time and money into it, you might as well go a 350. For the small difference in economy, I'd build a fresh 350 short block, then if necessary freshen the TBI heads up and reinstall them regardless of what they were.

I'd go with the 7.3. This motor was a combination of a 265 cubic inch block with a 350 crank that resulted in the not so lovable 305 engine with a bore of 3.75 inches and stroke of 3.48 inches. I would always get 17.5 to 18 mpg city or highway, maybe because It didn't have an OD.

An overdrive trans would also be worth the extra money spent for sure. What the the difference between a 305 and a 350 Chevy engines. I have a complete running and driving 87 GM TBI truck with a 700r4.

Both very close the 305 might get 1-1.5mpg more than the 350. The advantage of a large bore is it makes much better use of high performance cylinder heads. 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.

I had an Silverado with 305, automatic with lockup converter, and 3.42 gearing. The first-generation small block had been in production for nearly 50 years when it went out of production in the late 1990s, making such engines cheap to buy, cheap to modify and more versatile than perhaps any other V8 in history. What the the difference between a 305 and a 350 Chevy engines.

If power is your priority I would go with a 350 ci. 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. (should be #187 for a 305 and #191 or 193 for 350) If you have a 305 computer, get an aftermarket performance chip for the 350.

I have one, it does ok but i want more. If you went from 4.3L or 305 to a 350 then you certainly need to change it as they are different. I think we need to get a sticky thread going about the whole 305 vs 350 thing.

The 90-92 350 TPI F-Body engines (Camaro and Firebird) used the ECM, and so did the 90-92 305 TPI engines. The Chevrolet Camaro, Caprice, Malibu, El Camino and Monte Carlo implemented the 305. As for teh 305 vs.

ORIGINAL 305 V-8 PRODUCTION BLOCK (RE-INTRODUCED FOR SPRINT CAR SPEC RACING) Original, standard-bore block. Of all the GM 350-inch engines, the Buick 350 has the longest stroke, which lends to making significantly more torque than any of the others. 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.

If mpg and budget are of more concern I would go with the 305 ci. I'm getting around to putting my 75 camaro lt type on the road and was wondering what my gas mileage might be. 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.

The Corvette used the ECM on the 90-91 350 TPI engines. So i'd say take the 305 if it was free and use that while you build up a 350. Also you should looka t if the engines are carburated or tuned port injected (TPI).

MerCruiser 3.0 MPI/TKS - 181 cid. 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.

Im going with a 305, my 2.8 just isnt cutting it, but i dont want crazy power, or schitty gas mileage. My truck gets 10 to13 mpg towing, depending on weight. My neighbor has 1500 w/350 with all the mods-no cats-flomaster -k/n he gets 12 mpg not towing anything- mpg isnt these trucks strong suite!.

There are still plenty of them out there and some are bargains. Fuel Economy of 1990 Chevrolet Vehicles. The 305 Engine had terrible flowing heads from the factory which is what gives them the notoriety of being unable to perform very well.

The Holley 0-S Carburetor is used by thousands of Chevy 305 owners around the world. Your actual range may vary based on several factors, including temperature. Chevrolet's small-block engine can be rebuilt in a number of ways.

Comparing apples with apples (cam, heads, compression ratio, and so on) you will be down only about 15 to 25 horses over the 350. I put over 50K miles on my truck last year alone. EPA MPG Owner MPG Estimates 1990 Chevrolet Twin-Turbo Corvette 8 cyl, 5.7 L, Manual 6-spd Premium Gasoline:.

Fuel economy is rated at mpg city, 27 mpg highway and 23 mph combined. The RX 450h also uses a 3.5-liter V6, but it combines the internal combustion engine with an electric motor to offer 308. Going with the 350 will give you better performance from the start, as well as better fuel economy in most cases I've seen.

It will hit peak TQ around 1800, cruise RPM at 55 MPH in OD is about 1350. 1980s Chevy truck with 350 will mean a 3/4 ton truck. If your 305 needs rebuilding or replacing, by all means grab a cheap 350 from a wrecking yard and start with that-or better yet step up to a larger 3 or even 406.

I've been told, by several people, that on a 4wd PU, that a 350 will get better MPG than a 305. But my vortec 350 in my yukon gets up a little faster then my friends old z71 with vortec 305. (12-15 MPG I hope).

350 BARE BLOCK (PRE-1986 STYLE), 2-PIECE REAR MAIN SEAL. Subtract 305 from 350 and that will give you the difference (or interval) between the two numbers:- the answer is 45. Better Fuel Economy Factory Ratios Increased Power.

Since then, I have built and. GM introduced the Chevrolet 305 engine in 1976 to provide a smooth driving performance while allowing for lower octane fuels and lower emissions. I might consider the V-10.

That said, a friends 77 full time 4 wheel drive pickup with 350 only got about 9 MPG. But, I've also known several people, that had a 305 in a SWB 2wd PU that would get mpg on the roadand they were not in the habit of driving slowly. Alumiweld vs Hobart vs Bernzomatic Products & Reviews October 4, 1931 Model A 5 Window Coupe Rescued From A Basement Builds and Examples October 2, Hot Rod Engines 101 ~ Ford Flathead Technical Info October 1, Can This Stunning ’56 Chevy Hit 0 MPH?.

A 350 will do as good or better MPG in a four wheel drive/automatic - usually, because the extra load works the 305 too hard, causing a heavy foot on the gas just to go, which is fuel economy murder. Other than some incidentals, I think I could swap this in as/is. Vs 33/12.5- vs 35/12.5- vs 295/60- vs 275/60- vs 285/60- vs 285/55- vs 275/65- vs 275/55- Send us your suggestions and ideas for the tire size calculator!.

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. However, if you mean what is the difference between a Chevy 305 and a Chevy. 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).

Select MerCruiser Test Model HP Fuel consumption WOT;. Fuel Economy Engine HP Idle 1000 1500 00 2500 3000 3500 4000 4500 4800 WOT MerCruiser 3.0 MPI/TKS – 181 cid 135 hp 0.5 1 1.5 2.9 3.8 4.8 6.2 7.4 9.3 10.5 10.5 GPH MerCruiser 4.3 TKS –….