305 Heads???

[Chevy_Power_68]

Hi i have a 383 stroker, and is making a good amout of power, but it has 305 heads on it, is this a good thing or not?

[DanO]

Originally Posted by Chevy_Power_68

Hi i have a 383 stroker, and is making a good amout of power, but it has 305 heads on it, is this a good thing or not?

That depends on a number of factors..

Have you put the head on a flowbench, or know the Flow #'s?

What are the vavle sizes, compression ratio, HP levels, etc..

Im sure it could be a good thing or a really bad thing, we need more info to even come close to knowing.

[89VetteFromHell]

if they flow good, then from what i hear the 305 heads on a 350 block actually give it a better compression ratio

[Chevy_Power_68]

it has really good comp. 10.5:1 and it seems to flow better than normal heads.

[WishIHadACamaro]

Originally Posted by Chevy_Power_68

it has really good comp. 10.5:1 and it seems to flow better than normal heads.

are these stock or aftermarket 305 heads?

[Chevy_Power_68]

they are stock, i heared that the combusion chamber may be to small. is this true?

[WishIHadACamaro]

small in comparison with heads of a 350 and/or aftermarket heads.

a 383 stroker with an aftermarket head the produces the same CR will have better flow rates.

http://www.mortec.com/castnum.htm

check out that site to see what size combustion chambers you have with the casting number off of your head.

[Bandit79]

I put 350 heads on my 403, kicked the compression way up 8.5:1 to about 10-10.5:1, they had some machine work done to them tho.

made the car ALOT faster.

[Black93Z]

one of the guys i know put a set of old vette 283 heads on a 383 stroker. i said your nuts!! its C/R is 18:1 it runs through trannies like no other.

[83-z]

im buildin a 350 roller to drop in and i have a pair of 87 305 heads (new) and im not sure if they will help or hurt it....i have been told good and bad things. so im confussed too! :smt017