[tracterman2]

why are they better?? do the 305 heads have a smaller combustion chamber, increasing compression?? or do they have larger valves in them?? I have heard the 307's do not breath very well...I was told it was the cams though..they say they do not have very much lift at all. I'm sure I could find some heads fairly easily...I know where there are some 327 heads at...would that work??