Quote:
Originally Posted by 17camaroSS
The factory rocker will last at 7K+ rpm with a trunnions upgrade like CHE. Brandon Hill run them, Brady ran them in his car, along with a lot of other guys/gals out there spinning their cars up above that. Once you going to an aftermarket rocker you’re adding more weight over the valve which isn’t the best thing. Also, Gwatney did a test with stock and aftermarket rockers. The factory rocker with a trunnion upgrade made more power and was more stable at higher rpm than the aftermarket stuff.
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It really isn't RPM specific, it has more to do with the cam profile and lift. Anything much over .630 lift and the stock rocker arm starts to side load the valve. That isn't good for longevity but with the correct type of valve guide will help. I agree for most setups stock rockers work fine. Weight over the valve is a issue but there are ways to address that. It just depends on the setup... for a .700 lift solid roller that needs some serious spring with link bar lifters, going shaft mount that are fully adjustable for precise preload adjustment is probably a better choice. A Hydraulic cam under .630 lift with a decent drop in lifter, Stock rockers seem to work fine and have since 1997 when the LS1 was introduced.