I'll have to be the dissenting voice when it comes to Highlift Johnson (sourced from the good source on this forum), at least in my case .. they were the lifters that failed, then replaced with US made Mellings (type with the hard cap on the bottom) that didn't fail. Antidotal I know, perhaps the Melling played better with the Melling Cam.
I wonder ... is the valve train geometry of our "originally HFT" engines the same as the valve train geometry of modern HR engines that last many thousands of miles with no problem? Does the original HFT geometry handicap HR systems? Surely the ideal geometry required for a modern HR is not the same as the geometry used 50 years ago for HFT.
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