I've been looking over the past couple days for pistons for my motor build -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.

 

That'll be very hard to accomplish on a 383 (technically a 381 or whatever.). You'll need huge dish pistons, and/or 76cc heads. I know Keith black makes the 22cc D-cup pistons, those are hypers though, and i'm not sure if they have it in .020 over.

Just keep in mind, if you find that .020" piston, if it's more than $125 more then the .030" version in a more common brand (like TRW), then it's better to just rebore the block.

 

yeah I'm just trying to figure out what my options are, go ahead a drop of the block or luck out and find a piston that will work. What pistons are some of you turbo/supercharged guys running with your 380 whatever's? FYI I'm stuck in this situation because I decided to run a D1SC instead of a bottle after I had everything machined and balanced. Don't think I want to run the pistons, hyper. (9.6:1), I aldready have with 10+ psi.

 

contact summitracing or jegs and tell them what you are looking for and they car probably help

 

tried that all they could come up with was the trw part number. I'm tempted to say screw it and run the hypereutectic pistons I have and run a alky/methanol injection setup. I only "PLAN" on running 10-12 psi

 

I run the je extreme duty inverted dome 232514 (400ci w/5.7) with 74 cc heads that have been milled a little. very nice looking pistons. I also upgraded to the better pin. I have seen many pistons, and these are the best looking ones i have seen. (not that looks mean anything). I'm running N/A this fall, and this winter i am putting on a pair of SC61's.

 

the JE part# I have are those same pistons, but for a 383. I think I'm just going to run the pistons I have and hope and pray it never knocks or goes lean. Right now it's looking like pistons are going to cost around $650, $125 for block work, and another $175 to get everything re-balanced. Hope and prayer beats out $950 at this point. I guess when we get around to try to tune it I'll just run it a little on the rich side.