I have set of those I'm going to try as soon as Axtell can ever get my pistons in order. I was up around 11:2-1 before tear down and ran RS657 , 9wf, 662-1 and some others but will be knocking the comp down to 10:5-1 neighborhood when it goes back together. if you look at these on the big boyz cam compare site use the Edelbrock cam for some reason the crane one's numbers are wrong