if your going to run nitrous why not buy some 11.5 compression mahle pistons for it. Them with a set of decent cams you make 230hp before the gas just food for thought and your pistons will be alot happier when you spray them .I have seen stock pistons take a 75 shot for years but h22 ring glands are weak so i would recomend running mahle. Jj ran tens with stock block mahle pistons and a tone of spray for years . I want say how much he sprayed on them before he finaly toasted one but it was alot lol call him up im sure he wil be glad to help. If you dont want to spend the money on pistons find you a f22 some were that has a blowed head gasket . Take the crank and rods out (which are the same specs as a h23 crank and rods)and use your h22 pistons that will also give you 11.5 compression with a nice stroke to go along with it .just trying to help .