MiradaMegacab
Well-Known Member
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.Hey can you post exactly what parts and part numbers you bought? I'd love to hear more details about what you did. Been thinking about this too. Thanks!
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.