I run the standard Mopar drives on the flat tappet cams with the high volume oil pumps and the bronze/brass, what ever material they are, on the steel billet solid roller or steel billet hydraulic roller cams No noticable problems so far I think I ask Comp Cams about buying a composite gear from them for the steel billet race cams but they didn't make a gear for the Mopar V8 yet, either size That was several years back, maybe the next time I need one for a solid roller cam I'll ask again