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I would use a roller but since the roller lifters I have heard of here and elsewhere are not reliable .....I will pass on that idea.



Interesting. What's happening now with the newer roller lifters? I've seen something about this in another thread but couldn't remember exactly what was being discussed at the time. Can you tell more?

Next thing. Maybe a little off topic, but what exactly makes a "flat tappet" cam vulnerable now opposed to several years ago. I know the quality of oil has changed and the zinc/phosphourous is way less nowadays (for a flat tappet cam), but what makes the roller a stronger cam that it doesn't need the same amount of zinc? Is the flat tappet cam just weaker? Made of a lesser strength of metal?