Powerglide tappets have a micro-finish bore that allows a running fit of .0002in
Big Axle rollers are designed around three working parts
The outer wheel/roller has a 27% greater wall sizeless harmonic distortion for better tracking of cam lobe
Pin bearings are decreased in size by 12%, which increases rpm for more precise tracking
Axle size is increased 36% and doubles as the inner race, so the pin bearing and complete roller assembly now rotate around the axle instead of an inner race, eliminating all possible movement in and around the axle
Made in the U.S.A.