speedmaster CNC 408 what cam

903-904 face dia lifters are MOPAR solid, mushroom, hyd, hyd rolller, solid roller
many variations of solids have been made over the years
standard, chilled iron, hardface overlay, tool steel etc
edm oiling is relatively new but a great idea
or you can grind a flat on the side of the lifter as in a v6-229 chevy or some buicks see a pic in a lifter catalog- easy to do and can be more easily done on a hyd than edm
ford lifters are .875 and lots of solid development due to NASCAR use
Chevies are .842
but base circle also makes a difference