Best hydraulic flat tappet lifter?

nm9stheham said

Since we had a new Crane lifter gradually go flat and replaced it and all is then good, do you think it is more likely due to some speck of dirt in the lifter....or ?? (BTW, no problem with the lifter bores in that block...it was virgin.) Trying to figure out what you are doing right and others doing wrong, if indeed the lifters are fine. We keep our stuff pretty clean during assembly.

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Unless a pro shop bored the lifter bores (not factory machining) the bores could certainly be a problem. That's why the majority of the aftermarket blocks (not just Mopar stuff) need to be fully re-machined.
A lot of damage comes from valve train problems. Cheap pushrods, wrong springs, cheap rockers or shafts, and poor geometry will all affect the ability of any lifter to function long term. Plus all parts have some that will fail due to production. I couldn't tell you what yours was. I can only tell you I don't have the problems. Based on an estimated number of overall sales vs buyers with issues, and what I read in regard to approaches to assembly and break in, I blame the users...lol.