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Hydraulic-roller cams (top) are generally built on harder camshaft cores to withstand the higher unit loading pressure of a hardened roller follower. Flat-tappet cams (bottom) are generally hardened cast iron. This is the main reason why roller cams are more expensive.
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Hydraulic-roller cams (top) are generally built on harder camshaft cores to withstand the higher unit loading pressure of a hardened roller follower. Flat-tappet cams (bottom) are generally hardened cast iron. This is the main reason why roller cams are more expensive.  View Related Article

 

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