What brand pushrod, and were they hardened? How bad ,do the adjustment balls look? Had a similar situation with cheapo Cat roller rockers, & hardened Crower pushrods. The adjustment balls weren't hardened, the pushrods were. Turned the adjustment balls down to a step, just like a lathe. Replacement of the balls with hardened Comp stuff,problem solved. It sounds like a similar metallurgy problem, I.M.O.
