Googled roller cams and found this in a mopar catalog: G. Tube and Peen Tool Package
Blocks off oil to right-side tappet bores. Required for race engines with high-lift
roller cams.
1 P4120603 Tube and Peen Tool Package (Small Block)
If you want to see entire catalog:
http://www.mopar.com/assets/pdf/performance/catalog/Small_Block.pdf
I believe this is used on solid rollers not hyd.
