im getting either JE 12:1 or 11:1 B20 pistons for my soon to be bored out b18c1. my question is what length rods do i need???stock lenght?? and do i buy them for a B20 or B18???:confused:

:bananasmi

K...you have a GSR motor, GSR crank, and B20 pistons...

Ideally, you want 84mm pistons for the b18c1. The small end of the rod is a little wider on the b20. You will need stock length rods no matter what, but you're going to have a little more play on the top end if you're using b20 pistons. Also remember that if the compression ratio was measured for a b20b head, it's going to be a bit higher in a GSR head.