Thread: Dont use Proformance reman engines!!!!!!

the pistons are different because thats how you change the compression.

Most of our heads have the same combustion chamber size. Except when you have them milled of course.

n/a are 9.4:1

s/c are 8.5:1

The wrist pins are also smaller on a N/A piston compared to a S/C piston. They're not interchangeable with rods.