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Hydraulic-roller tappets are 0.630 inch taller than hydraulic flat tappets. The factory compensated by increasing the height of the roller-tappet boss in the block. This increased height also means hydraulic-roller tappets are also much heavier and therefore harder to control at high rpm.
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 Hydraulic-roller tappets are 0.630 inch taller than hydraulic flat tappets. The factory compensated by increasing the height of the roller-tappet boss in the block. This increased height also means hydraulic-roller tappets are also much heavier and therefore harder to control at high rpm.  View Related Article

 

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