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I have a buddy running a set of 5.3L heads, not sure if they are milled, but I don't think that the compression will be an issue. I recommend posting this question on LS1TECH or in the TECH section. You will find the really hardcore folks there and they will be able to give you a better answer to your question.
Anbody running 5.3 heads vice 5.7. I was Just curious if they will raise the compression of the c5 if milled to .010
R,
Free
They will raise the compression, even without milling. IIRC, the chambers are 59cc. They have smaller valves (exhaust only, I think) and the ports will need work to equal LS1 flow. A set off worked over 5.3L heads might help, but stock, no.
All this knowledge in here and no one could help! I sure miss EVIL TWIN, he was "friendely" and very relaible.
2 things...
number one... you posted this in the wrong section. try posting in "TECH" as you might get a little more help over there.
2nd thing.... as much as i love this forum... i find technical questions are best answered over at ls1tech.com. lot more "technical" knowledge over there.