Hey guys I was just reading the july issue of GM High Tech, and was looking at the Apt Pupil story on the zr-1 corvette cam install, and in one of the pictures on page 43 the guy is compairing base circles on the stock and aftermarket cam. I was just wondering if you too the base circle of the stock cam and subtracted it from the base circle of the aftermarket cam, then divided that number by two, would you have the diffrence in pushrod length? Just seems to be an easier way than shimming rocker arms, or is there some reason you cant do that. Thanks.