ok stock pistons and i a going to be putting on some 243's i have a 228/232 .588/.574 112+4. i want my compression to be 10.9-11.0 how do i need to mill and still have enough valve clearnce. i am also be using stock gaskets. thanks for the help. also if anyone could help me find out my DCR that would great. how much will the DCR change with almost a whole point increase in SCR. thanks
nick

 

Its not possible to tell without measuring. Stock LS6 heads start as 65cc chambers. figure every .007 you mill drops the chamber volume by 1 cc. Without measuring, you cant tell how much space you have P to V. Use this page to calculate your SCR / DCR: http://www.kb-silvolite.com/calc.php?action=comp

 

If your heads have stock valves then the valve drop should be .150", you should be able to mill them .030" to get them to 61cc and still have enough P to V. We have run our 5.3 heads with 2.02 valves and a valve drop of .100" with that cam.

 

ok thanks guys

 

well i got some LS6 milled .018" and i will be using stock LS1 gaskets. am i going to have PTV clearance probs you think or not. i know that you said its not really possible with out measuring but i guess what i really want to know how tight my cam is before i milled them. anybody have an idea?? thanks

 

i have a 228/230 cam with stock ls6 heads milled .018 and a cometic .045 gasket.I have .085" intake clearance and .135" exhaust,stock block etc..you should be fine,but check it because if your cam is not degreed or has a lot of advance ground in then you might be close on the intake..I have a 112 lsa with 2 * advance

 

just saw your sig,with a 112 + 4 and stock gaskets it should definitly fit,check it anyways and see how close it is,and then get back to us with numbers as i am curious..

 

it will be 2 weeks prob but i will let you