I don't have access to the part#'s. I tried looking on Diamond Pistons website but had no luck. I used their 2618 forged piston 4.030 with a -30cc dish and 1.55 compression height. Diamond charges $8 per piston to relocate the valve reliefs. The 2616 forging and deep -30cc dish is perfect for boost and results in a 8.5CR. I'm running a 65cc head and 10PSI of boost. I figured a 3.79 stroke divided by 2= 1.895 + 6.125 rod= 8.02- 9.58 deck height= 1.56 compression height, resulting in the pistons being .010 in the hole. So pretty much if your using a 3.79 crank, look for a piston with around a 1.56CH. Using a 6.123 it a longer 6.125 K1 rod will get your deck height close.