The good thing about the R series motors is there is alot of parts for these little motors from stroker kits to forced induction its all out there. LCE is always a great place to go. I think they actually have 20r heads built already with whatever you want, of course its costly, but in the long run it'll pay off. Make sure you do your research too. LCE is a great place to call with any questions, ENGNBLDR and putneys 22reperformance are who i call or email alot when i have questions. They are all top of the line when it comes to customer service and knowledge. They can help you get what you're looking for and make sure you match all the parts up right. Double row timing chains, high capacity rocker shafts, oil pumps, and so on shouldn't be overlooked because reliability is just as important as horsepower. Im not a master of these things though so make sure you do research on your own too so i dont mess you up by accident.