Morell Hydraulic Roller Lifters

Newbomb Turk said

Just because the lifter rotates doesn’t mean the cam won’t go flat.

See post 15. He explained it very well. If the lifter bank angle is off a bit, if one lifter bore is off front to rear or something like that, the lifter may rotate but if you have made the contact area very small. The cam/lifter will fail.

For the cost of resurfacing a set of lifters it makes no sense to try and use a used cam and lifters.

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From my understanding the contact area is minimal regardless due to the angle of the lobes and convex shape of the lifter face, although I guess I can see how the wear pattern locations would be changed with differences in lifter bore angles and such which I feel a "re-break-in" of the cam and lifters would solve.

I understand all the nitty-gritty theory but in reality, how many here from experience have reused a known good set of lifters and cam in a different block with the lifters kept in proper order and actually had them fail? Sure, it's only one example but I did it myself and didn't even bother to re-break-in the setup and had zero issues. From everything I've seen and read so far it's been a pretty standard practice and I've never heard of an actual failure if it's done properly. All the failures I've been hearing about lately are due to new FT lifters being machined poorly from the manufacturer.