Drag pack 5.7s are 12:1 or above.

I think Diamond, CP, and JE should all make pistons for that combination. They wont be cheap though, since they are an NHRA approved part.

Jerry - hemidup i think is his username can tell you alot more about this combination. he has a 5.7 engine in his challenger I believe.

They run a 2.100 chevy rod journal, and a 6.200 rod length. You can take a stock 6.1 crank and turn it down.