Thanks for the replies. I failed to think about the lift. I do know that about 510 lift is a safe limit to use for stamped rockers. I see the power level numbers put down by mild rollers (by my term mild I mean 218-220ish @ .050) - They are at levels that would take a real agressive rumpity hyd flat tappet. I have nothing against hyd flat components- the brand new cam I have awaiting install is an Engle grind 230 dur .050 and 504 lift.