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2007 GT
1969 Cougar Eliminator B302
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2020 Edge ST
2002 F250 V10
It can be metallurgy or hardening process but this article explains the other reasons. A very good read.
https://www.motortrend.com/how-to/check-flat-tappet-lifter-crown-lobe-taper-lifter-bores/ Chuck
https://www.motortrend.com/how-to/check-flat-tappet-lifter-crown-lobe-taper-lifter-bores/ Chuck
