i am building an iron block LS1 for my truck and will be running 5.3 heads, 862's, with 2.02 in and 1.575 ex valves

my question is, who is running head like these and how far are you milling them down?

what size (thickness) head gaskets are you running?

im trying to get a 10.75:1 to 11.0:1 compression ratio out of this motor

any and all help would be greatly appreciated

-John

 

its going to depend also on your pistons and cam.

 

they are stock pistons and the cam is an MS3 113 lsa