Quote Originally Posted by allmotoronly
well I'm telling you from my personal experience, the type S cams alone will make a noticeable gain in power. The pistons in a JDM H22A type S have 11/0:1C/R, the base JDM H22A have 10.6:1 C/R, and the USDM H22A has 10.0:1.

Upgrading pistons is not an easy thing to do in a H22A since it has FRM sleeves and can't be bored and in most cases can't be honed. You pretty much have to resleeve the engine, or hope that your cylinders are in good enough condition that you can do a very light hone and run standard sized type S pistons.

yes fiber reinforced matrix sleeves are a pain but the strongest for NA application.. someone with skill (GOOD SKILL) can hone a h22. only company that i know of is mahle that has pistons that mate with frm!