Quote: Low pivot is the way to go with high spring pressure. Mid-lift works well for moderate spring pressure.
The low pivot setup puts the rocker arm perpendicular to the valve at 2/3 lift rather than mid-lift. Consequently you have more scrub at low lift (low spring force) but less scrub at high lift (high spring force)
The old Chevy engine builder guide from 30 years ago recommended low pivot for high spring pressure but even though it has been around for a long time not too many people talk about. Most everyone recommends the mid-lift method including most of the cam company websites.
It takes a ton of work to do the low pivot method on a stock Mopar head. Relocating the shaft is a pain. Longer valves with shorter rocker arms is one way to skin the cat or mill off the pedastals and use Max Wedge style blocks for the shafts.
Pretty sue the factory small block Chevy engines were and are set up using the 2/3 lift method. My brother recently purchased a Chevy 350 crate motor that was set up that way. I'm sure it is all about longevity on a factory stock motor.
