the thing that is good about h23/h22 is that the higher piston speeds help to make tq at a lower rpm, the best way to do it is to get an h22 and throw a h23 crank in it, w/h23 rods and pistons, or h22 rods and custom pistons...i thought about my self but deemed it not nessary in my build up, however i will get you some contact info on my friend thats making 550+ whp w/it for almosta year now...buy the way he drives it every day