81 mm is the stock bore correct? I'd really like to stay stock bore just to stay axzy from the hasssel of oversized pistons and piston rings. Besides if I stay at stock bore then if I ever do blow the engine I can go back in and have the cylinders rebored to .030 over. If I do it now then I want be able to do that. I'll just be SOL.

 

OS pistons aren't going to cost you any extra, forged pistons are basically custom parts anyway. And if something does happen you can always bore to 84.25 or 84.5mm, which are the same service limits as the 81mm sleeves will be.

Again, there is no reason not to.

 

YOU MUST sleeve your b series blocks if you are going past 14 psi of boost!!!!! dont take a chance. hondatuning.com and sport compact magazine will both tell you this. I am doing the same **** as you are!