Recently read a post on another site that said aluninum and etc rockers were only good for about 20k miles, and should be replaced in drag racing engines every 2 years. Something to do with the stress and the amount of stress. Kida like the the stuff that the airlines had to figure out a while back. If I was going to go afer them I would go for a steel rocker, with a roller, and clearanced for the lift of cam you want.
Dennis
