Broke no.4 ring land the other day making a pass. What U.S. F-series motor uses the same piston as my JDM DOHC F22B? I've got a good set of U.S. F22B2 pistons from a 94 Accord LX but I can eat cereal out of them! The compression is WAY different between the two pistons. I'm trying to only change the broken piston but if I have to I will change all four. Cylinder walls look good. Still got a little crosshatch. Any feedback will help!! Thanx guys!!

 

I don't think the compression is way different. I've heard a lot of different numbers, but I think the F22B has a 9:1 CR. You could just swap out all of the pistons to keep it all the same. Since you're opening the engine up anyway, why not put in forged pistons?