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Author Topic:   350 to 305
Rookieracer76
Dirt Maniac

Total posts: 182
posted August 27, 2002 08:59 PM
I have bought a new car for next year. Im going to put the motor that is in my car now in it. The motor in my car is a 305 chevy motor with racing pistons and a crankshaft. Over the winter i plan to put in brand new cam and new lifters. I have a 350 motor in my garage that does not run due to a cracked crankshaft. My question is will stock 350 valve springs and rocker arms give me more power the the stock 305 ? I dont wanna spend too much money so i'm looking for small cheap tips to give me more power!!! Thanks!

carscomefirst
Dirt Full Roller

Total posts: 45
posted August 27, 2002 10:01 PM
350's and 305's use the same rockers and springs as each other. A cheap way to go would be using "Z28" springs(depending on your cam) and 1.6 Ford rockers. I believe that some 300 6cyls use Cast 1.6 rockers for a 3/8 stud.

[This message has been edited by carscomefirst (edited August 27, 2002).]

racer17j
Dirt Forum Champ
Total posts: 1565
posted September 05, 2002 04:44 PM UIN: 54865418
do you have a compression rule is not i'd put the crank out of the 305 in the 350 and the heads also will give you more compression then get the z28 springs like like cars said and just get a set of long slot rockers either 1.5 or 1.6 depending on your cam

uforacing51
Dirt Freak

Total posts: 349
posted September 05, 2002 05:07 PM
305's and 350's run the same crank, look at the last 4 they should be 2442 or 4224 one or the other. the rods will work in the 350 also, obviously the only thing that won't is the pistons.

carscomefirst
Dirt Full Roller

Total posts: 45
posted September 05, 2002 07:15 PM
quote:
Originally posted by racer17j:
do you have a compression rule is not i'd put the crank out of the 305 in the 350 and the heads also will give you more compression then get the z28 springs like like cars said and just get a set of long slot rockers either 1.5 or 1.6 depending on your cam

While 350s and 305s have the same stroke and even use the same casting on the cranks, there is a ballance difference between them. I have known people to interchange them with no problems, but I know some that ran into a vibration using a 305 in a 350. I would agree that a 350 is a better way to go.
good luck


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