difference between hydro and mechanical rocker shaft diameters

Shafts not round? How does that work? The one he took off to measure was overtorqued and was egg shaped around the bolt holes. LOL

Lol exactly!
How many times has that happened? We got those shiny new hold-downs, and feels like a roll of toilet paper under your torque wrench.
I was so glad when Mopar came out with the 'heavy ' shafts.