Roller cam/lifter problem

The lifters profile, rate of lift on the ramp, can be more aggressive than a Hyd. roller. This produces more area under the curve. That equals power.
Not all solid lifter cams are made this way.
AKA, very aggressive.

A Hyd. Litter can only take so much of an aggressive ramp rate before collapse. The solid lifter does not have this problem.