Originally Posted by Fiftydriver
Back to the LSX376-B15 long block, is there anyway to raise the compression ratio near 10:1 without replacing the pistons, such as shaving the heads to decrease combustion chamber volume or go with thinner head gaskets.
You would need to take out roughly 10cc out of the chamber to get up to 10:1, which is kind of a lot. By the time you do that, considering the labor, machining costs, new gaskets and bolts, etc you may want to consider a custom LS3 shortblock. I just quoted a gentleman looking at a 416ci ERL longblock for 12psi and it was pretty comparable to the LSX376.