- Cam bolts into 66-84 (except 80-81) Big Twin engines with no head work; on 80-81 engines the height of the stock H-D valve guides restricts spring travel (and cam lift) to .430" or less
- Spring travel and clearance, plus clearance at main bearing boss must be checked on 80 and later models
- More mid-range and high-end power; idle unaffected