I've been looking over the past couple days for pistons for my motor build -GEN l 383 (4.020 bore, 3.750 stroke, 5.7 rod). As one would guess, I'm having trouble finding anything for 20 over. Does anyone know where I can find a forged .020 over piston that would net me close to 8.5-9:1 compression with a 64 cc head? I've been able to only come up with 2 parts numbers (TRW/Speed Pro part# LW2618F30 and JE part# 131631) however both of those are for .030 and the machine shop wants $125 to take my block to .030. Any help would be appreciated.