somebody correct me if im wrong but i dont think steph papadakis uses an actual honda h22 block. i think he uses a dart block and possibly a honda h22 head. i dont think that you could bore and stroke an extra .3 liters out of a honda h22 and have it last.

 

its not meant to last foo

and yes its a 2.5 liter
i have a video somewhere of them saying it is over 800 HP, and the dude runs low times, like low
but he has a tubular frame and fiberglass body
some dude on here had around 500 horses in a h22 and it was in a cvic EG

~boom

 

The biggest we have gone is 2.6 liters. Stephan used a H22a block and h22a head.