[shaker455]

Originally Posted by gtofreek

It's not the lifters that are failing. It's the fact that the oil band is in the wrong place. That prevents them from filling up when they are on the base circle. I modify the blocks so that is not a problem anymore. Your machine shop just hasn't figured out what the real problem is, they just blame the lifters, which do have the band in the wrong place, but the lifters work fine when block is modified. These are Hylift/Johnson slow bleed lifters so they do not have too much internal clearance.

Thanks Len Caverly and our shop address that issue years ago.
Best on your return