I have a 331 with aftermarket heads. I used the push rod lenth comp cams recommended and the rocker bottoms out on stud. Just wondering if what I am doing is wrong? I used a 1/2 inch longer pushrods than recommended and it seemed to fix the problem I quess. I've never had stud mount rockers before. Does the rocker arm just free float on stud? Also with the longer push rod the roller tip doesnt sit on the center of the valve stem. Any suggestions?