Quote:

hi
the cam lobes are ground with a taper that the lifter face is always presssig cam rearward, this angle also causs the lifter to rotate !

roller cams have no taper and need a button !



Correct answer... If you use a roller cam you need a thrust button, otherwise the lobe taper takes care of thrust... But a thrust button won't hurt anything & many high performance builds run one...

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