small block hyd. roller lifters

The stamped arms are weak for much over a true .500 lift 'the pressure required for the lift'...probably end up spearing one or more. But technically Dion R is right, the pushrod length is all that makes the diff within the rockers noted limitation.

The issue comes from a variable.. where...say you have heads that don't have the tips all even , or when the deck are off and canted end to end...and that's where an adjustable rocker arm works best so you can get about the same with all of them and not have various length push rods. That's just the objective way to look at it in a general sense.