yeh to many different factors that come into it, first time we went we had 57hp, second time 52.4 but that was with a 3.9 not 4.1 like runnign before and he said diffs are atleast 10hp diff between rations
U can buy brand new pushrods threw crow cams just ring them up and say how long they are and the ends and theyll hook u up :) think its around $60 for a set