Those look VERY cool. I had one on my N/PS hemi. It actually served no purpose, and my last 3 hemi engines had timing chains. In 2005, I paid 10K for all the Jesel stuff in my hemi.
That was good-guy pricing......Never again.
My last engine [SBM] REQUIRED Jesel rocker gear, though.
Thank God, I'm done with this stuff. Too much money and time wasted.