I'll be using the springs that come installed on the 440Source Stealth heads so I think the pressures will be a bit higher than that? Also with the extra head flow and modernized 440HP/Road Runner cam I imagine it should make power to at least 5000 RPM although I'll only rev it that high when messing around unloaded. Heck I'd probably make a few passes down the drag strip at Bandimere just for ***** and giggles. If the grooves will be more of a liability than a benefit I'll just post a Wanted ad for some stock unmodified BB rocker shafts. And anyway, I thought the grooves were more of a benefit when running factory-style iron adjustable rocker arms since they have a more uniform contact area with the shafts?
Also @mbaird I'm not sure if these are heavy duty rockers or not, seller didn't mention anything about them. I feel like there was a Mopar Action article years ago too where they measured factory rockers vs. HD replacements and they actually spec'd out the same as far as metal thickness in the high-stress areas?