hey thanks for the response, the reason for 2.2 heads was i had them, its a dual port head which are ported with brand new valves, had machined/milled,. so it probaly will be a decent increase, i will have a bigger bore/displacement and still trying to fit in the same size combustion area, with a head gaskets that are half the size as stock, for either one, 2.5/2.2, // 2.2 stock=9.5to1//2.5 stock=9.7to1//. i also planning on using a a/f controller, and am going to just over make it breathe better,headers,air induction systems, but right this very moment, cause im not done yet, and im sure some kind of problem will pop up