If I were you, I would get 8500 rpm out of your head! Get your power with more mods. 8500 rpm in a H22a would be the end result of a lot of $ in mods (or the first step to blowing your engine hah), and by that time, you probably wouldnt need to rev that high to get the performance you want. If you try and get to 8500 without internals, better prepare another "buy me an engine" speech for dad. Do some research before you ruin that engine, H22a motors are nice, it would be a shame to blow it.

oh, and if you dont care about blowing it, I can give you my address to send me some free money.