Everything has its limit/ceiling, resonance frequency is not something I'm worried about at the level of rpm operated at. After a ton of 6900 shifts the lifters look new. I can believe you had a failure at some point , that you were at such rpm level that the engines internal operating frequency matched your roller wheel frequency... did the body crack ?did the wheel disintegrate? So far the only talk of this phenomenon ... is coming from you. I'd like to hear more specifically as to how, what brand,rpm, app this occured. The lifter body fits a .904 hole, that makes the body a .903 body with .750 wheel. Sbc uses both .750 and .810 wheels. Fitting isnt seemingly an issue. I'm one of those guys that has always heard nightmare stories from people about not to use this or that most of the time I find out the problem was with them and set up, or use beyond the products app. When I do share a failure .. it turns out to be unrelated to their explanation/cause... not 100%...but about 99%.
