michaelprice83

What if I were to mill some H22A4 pistons down 1mm to the proper compression height for an F23? I'm just not sure I want / need to use forged pistons with my build because of the cold winter 0 degree driving / low power goals ~ 200 hp. K series pistons reversed and fly cut won't give me as good of a piston face as an H22A4. I'm thinking 1mm of milling won't compromise the pistons that much. This would still be for a DD all motor build. I'm thinking some NPR pistons for ~ $80 could work nicely for a moderate power build. I realize the top ring would also be 1mm closer the face, and perhaps some cryo treating could be a good precautionary measure. Am I overlooking anything? Someone experienced chime in please.

93h2beg

the h22a4 piston is 1 mm bigger around than the f, 86 vs 87.
take the f23 crank rods and h22 pistons in the a4 block (97+) both have 55 mm mains. so u put the f23 crank and rods in the h 22 block with the h pistons. and now ur sitting somewhere around 11.5 to 1 compression, as long as u run stock ish cams ull have plenty of v2p cleanance.

I helped my friend do this exact build, made good power, he just went crazy advanciung his cam gears and kissed the pistons with the the valves, he also had the pistons milled, which we figured he should not have done. with his head work in the cc and the pistons being milled and the big cams his actual compression was just under 10 to 1.

unusual71

doing the machine work and then cryo treating would offset the cost quite a bit unless you have good hook ups.

kingofbattle909

iTrader: (6)

i wondered the same thing AFTER i bought the h22 pistons. forged ftw.