These cam profiles are adapted for O.E.M. mechanic tappets (37.5mm) with lash adjustment shim (33.0mm) between cam and follower ("shim over" type).
However, we advise to use race followers [ref. CC010] with lash adjustment shim between follower and valve ("shim under" type). This will eliminate the risk of shims being lifted from the cam follower. Also, the increased tappet surface will allow more performant cam profiles.