Not that this makes a huge difference but just want to input that I think after 03, the lq9 changed to stronger ls2 rods w/floating pins. Also, the gm gave the computer a slight performance tune taking advantage of the extra compression. Like I said, not a big deal. Just wanted to note the flat ls2 Pistons were not literally the ONLY difference....

Anyway, carry on. Btw, have you thought about milling the heads In combination with a thinner gasket to bump commission? Idk if this can be done for cheaper/at all... Just throwing the idea out there as I believe the 317's flow decent for stock to mild builds....