Roller 318 question

If I'm not mistaken, the XE268 is a hydraulic flat tappet cam. The lobes of a flat tappet camshaft are ground with a very small taper to promote lifter rotation. Without even considering the effects on timing of contact area (flat vs. roller) - I'd imagine the uneven loading on the roller tappet axle to do awful things to the axle/roller.

Cliff's notes version: nope.