to put a 20r head on a 22r it has to be machined to fit, if you want to talk to someone here in tampa who knows what hes doing, go to toyotaminis.com his user name is grounds and some numbers after that but he posts about everyday and just search around because the forums are dead there and it wont be hard to find his posts. Tommorrow we are going to cam my 22r with a stage 2 trd and 38 weber carb.