Well im looking into getting some rs pr3 pistons for my mild build.I need some clarification as to which mm they are I believe they are 82mm im not 100% sure im sure one of you gurus will know.Also im gonna be running built head on a stock bottom end.Im gonna be running crower 404s,with reatiners and valve springs,pnp on the b18b head.

 

they come in 81, 81.5, 82mm.

 

Ok thanks.Which size would you recomend for a built head and stock bottom end.I was thinking 82mm.

 

If its going to be a stock bottom end besides the pistons, keep the stock bore as well, 81mm.