I found out that I have an lq4 not lq9 and bought a set of stock ls1 heads to use with a 220/230 cam. I also found out that my stock lq4 pistons are bowled and not flat top, like the lq9. this means that there would be significantly more ptv clearance would it not? This being the case, how much could I mill these stock ls1 heads to further increase compression? I'd like to be at about 10.5 or so. What size gasket would I use in that instance? Pushrod length should still be the same as stock right? Where in socal could I go to have these heads milled?

 

no one?