More mid-range and top-end power for street and drag bikes. These cams work with solid or hydraulic lifters, and the idle remains unaffected up to 6,000 rpm with stock valve springs.
Cams bolt into 48-84 (except 80-81) Big Twin/Panhead 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
More mid-range and high-end power; idle unaffected
Spring travel and clearance, plus clearance at main bearing boss must be checked on 80 and later models