Whats the difference between an h22a1 and h22a4? I'm looking for forged pistons for my 00 type sh (h22a4 that will be sleeved) and all I can find are a1 pistons. Is there any difference? I'm also shopping for rods and come up with two different journal diameters. Any info would be a big help.

 

a1 is the 95-96 H22 ludes......a4 is 97+

 

go to the top of the forum and click faq's it will explain it all

 

The main difference is the closed deck to open deck design and the main journal sizes, unless you have a 97 H22A4 which has the same size journals as the H22A1.

 

92-95 A1 = 50mm mains and a closed deck
97 A4 = 50mm mains and open deck
98-01 A4 = 55mm mains and open deck


other than that, they are the exact same.


Read The Faq