Source for determing cc of my heads

[Ron AKA 71LS5]

Hello all,

Two questions regarding my stock LS5 heads.

1. Where do I find the chamber size specs for my car I have many reference at home. 2. What are the specs (cylinder size in CC's) for my heads. I have a stock 1971 LS5 454 AC/4sp.

Thanks in advance,

Ron AKA 71LS5 @ corvette forum

[Joe L.]

Re: Source for determing cc of my heads

Ron------

You will find this information in Alan Colvin's "Chevrolet By the Numbers" Volume 4.

[Wayne M.]

Re: Source for determing cc of my heads

Joe -- I've seen you quote volume for the intake runner in response to some posts. Where do you find that ? (it's not in Colvin)

[Joe L.]

Re: Source for determing cc of my heads

Wayne-----

I get that information from a variety of sources and I don't have it for every cylinder head that GM ever made yet. For performance cylinder heads, a lot of it can be found in the GM Performance Parts Catalog and the Chevy Power manual. Most of the rest of what I have comes from a number of obscure references which I happen to have in my library.

[Jeff M.]

Re: Source for determing cc of my heads

I was told by i believe Joe that the 71 LS5 head number3993820 is an open chamber head with 105cc combustion chambers and 2.06 and 1.72 valves. I have never seen the runner volume on these heads but would like to know them if you find out

[Joe L.]

Re: Source for determing cc of my heads

Brandon-----

Actually, the 3993820 casting has, nominally, 113 cc combustion chambers. Valve sizes are as you stated, though. Intake runner volume on these heads is, nominally, 260 cc.