I already know about the benifits of a dohc engin but I love sohc engins plus they are cheaper. I'm thinking of either sticking with my d16a6 and putting on a d16z6 head or swaping to an f22b1. I have herd all the stuff about the f22 being heavy and causing understeer but I'm not concerned about that. I guess what I'm really asking is which engin do you think has more potential. Notice I said more potential not more support, there is a differance there. Money isn't much of an issue, thats what savings accounts and patience are for. Thanks in advance for all opinions and help.