Milling on 317's
 

I have a couple of questions and concerns about milling down the 317 casting heads for a ls1 camaro. What should they be milled to retain stock compression on a 98 ls1 that does have JE pistons and stock thickness gaskets? Second, how well will these heads hold up after milling in terms of reliability for a daily driver? (granted milling is done by a qualified machine shop) With stock valves in the 317's what kind of power can I expect with the TR224 cam, MAC headers, 3.73's on a M6? How much do machine shops nromally charge to do milling like this?
Any help/advice would be GREATLY appreciated thaks
:rock:

anyone know?

I too have a set of 317 castings. I had them milled to bring the compression
back up to stock to go on my 2000 short block. I went with larger valves, springs and had the bowls ported.
I will be installing them along with a TR224 cam next week when I return home from Va. I expect them to flow alot better than my stock heads. It cost me $60.00 to have the shaved. There is an article concerning head casting cc info just do a search. It is my understanding that .005" equats
to about 1cc.

what would be the compression on my 5.7 ls1 camaro with the 317 heads unmilled?
what would the cr be on 5.3 heads?

stock unmilled 6.0 heads w/ stock gasket puts you at 9.6.
millled .030 w/ stock gasket puts you back at stock 10.1 compression.
unmilled 5.3 heads w/ stock gasket is 10.8.

guess you missed the sticky at the top ;)