I have been running the original rockers that came with my military 302 GMC. They are stamped and welded. I had some trouble last year with the rocker arm adjusting screws and lock nuts Replaced about 8 screws and nuts along with one rocker arm due to stripped threads. Also replaced one push rod because the base assembly separated from the tube.
I've been running the car since 1993 and racing it off and on in 10 Antique National Drag Races at Fontana, Ca. Head is a ported 302 with dual springs and big valves. Cam is an Isky E2 which is fairly mild: .298 cam lift, 264 deg duration, 228 dur at .050. I am planning to install a Schneider 286 F cam soon which will stress the rockers even more.
