Subtle Difference Between Ductile Iron Rocker Arms intake vs exhaust?

I don't disagree.....but it's not incorrect....at least not that I've ever seen. I've never once seen those holes plugged, so as far as I know the factory never did.

Read post #20 and #91.

Reworking the 273 Adjustable Rockers | For A Bodies Only Mopar Forum
Reworking the 273 Adjustable Rockers