Ive found both 20mm and 19mm for 8.5:1, 9.25:1, 9.5, 13:1 compression ratios. JE and Weisco seem to have both sizes off the shelf in 82mm and 82.5mm and prints for 81, 81.5, 83, and 84mm pistons. So Im not complainin :biggrin: Im most likely going to be using the 20mm pistons if I get the 2.0 block...But Ill stick with the 19mm rods I have if thats how it goes.