I think I had to much valve clearance which led to the failure of my solid roller lifter, after about 10,000 miles on the engine. When I tore down the engine, to my surprise, I also discovered the broken rocker shaft. I'm not sure when that happened, after or before or because of the bad lifter? Anyway, Gessford mentioned that the rockers were an early design because the adjusting nut was dead center and was later moved to one side of the rocker (I don't know why). 12,000 miles later, the rockers are still working good so they must be "OK" (I forget the brand).
