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Old 10-11-2003, 02:47 PM
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305 specs vs 350 specs

I just wanted to konw the tourqe and hp of the stock 305 vs a stock 350? Thank you.

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Old 10-11-2003, 06:11 PM
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1978 305 with 2 barrel carb 145 HP at 3800 rpm 245 ft lbs torque at 2400 rpm.

1978 350 with 4 barrel carb 170 HP at 3800 rpm 270 ft lbs torque at 2400.

There were allot of different 350 and 305 combinations depending on model year and vehicle. Above specs were for a 1978 Camaro Sport Coupe. The Z/28 Engine was good for 185 HP at 4000 rpm.

It's kind of an apples to oranges comparison too because the 305 came with 2 barrel carb and milder cam. The smaller intake valves didn't do much for making horsepower either.

Even when both engines are wheezers like the ones above the 305 will always be the week little brother to the 350. Same speed parts on the 350 will make allot more power every time.

I spent 10 yrs with a 305 that had a mild RV cam, weind intake manifold and 600 cfm holley. Car ran pretty spirited with 3:08 gears and 24.5" tall tires. 0-60 times were in the 8.5 second range with the single exhaust set up.

When I replaced the 305 with a low compression 350 using the same cam and above listed parts, the car ran a full second quicker in the 0-60 sprint. The extra 45 cubes via the 4" bore with the 350's larger 1.94 intake valves was probably good for 75 hp over the little 305.

Even if you had decent heads on the 305 and were making 1 horspower per cubic inch, the 350 in the same state of tune will be making close to 50 more. I don't like 305's.

Last edited by Goldduster360; 10-11-2003 at 06:21 PM.
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Old 10-11-2003, 08:59 PM
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305 vs 350

Well the motor (305)is out Malibu that was not stock, should have been a 350. The 305 is a four barrel with the four barrel intake. I do plan on going with a mild cam/racing and headers. I am building this car for a race car, Pure Stock class. It has just been real hard to find a 350, so I was wondering if it was at all worth trying to build this 305 or find a 350 and do it the rite way.
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Old 10-11-2003, 09:16 PM
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I can understand what you mean on finding a 350, used to be around here for a while, it took me 6 months before I found one, and it had self destructed, but didn`t vent the block luckily so I got good use from it. 305`s are every where, and yes they can be made to perform, but at a higher cost. the 305 suffers from a small bore so breathing potential is restricted. the stroke is the same as a 350 at 3.480 inches. the stock heads have small valves, small runners and small chambers and you have to remember, flow is power. the 305 in my opinion, is a great engine for a daily driver and reliable with decent fuel economy. but there`s no replacement of displacement, go with a 350, put a ad out in your local paper, go junkyard hunting, check your sale local papers every week, ask around, you`ll find a 350.
I have 350`s out of the ying yang now, i`m tripping over them really, and since i`m looking for 1987 and up only factory roller cammed 350`s now, I can`t find one to save my life, all i got are flat tappet blocks.
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