does anyone have a 4200 rpm spring? and what else would i need to get along with this? i have a holley black pump on the way, and a dd southbend clutch too.

 

some people say 60+lb valve springs

 

what about like push rods? or maybe harmonic balancer

 

probably 60lb springs at least... youd be better off getting Hamilton's springs, retainers and keepers... I think the stock keepers are the weak link and the retainers are heavy. The 60lb cummins springs have gone 4200rpm in my truck but i didnt like it a whole lot.