S&S H-Grind Cam For Harley Panhead / Shovelhead Features: Service part for Panhead and Shovelhead engines This grind is a dead-on reproduction of the stock cams used in 1948-84 big twins, perfect for repair and restoration of 74 and 80 engines Available for generator engines with inner cam bushings or inner cam bearings, and for early and late alternator engines with different cam gear pitch diameters Note that the front and rear cylinders have unique timing specs Bolt in Hydraulic tappet required H-Grind Cam Info: OEM-spec replacement hydraulic cam with unique front and rear timing specs Dead-on reproduction of the stock cams used in 1970 to 1977 Big Twins Perfect for repair and restoration of 74 and 80 engines Intake open front/rear 0/20 Intake close front/rear 40/33 Exhaust open front/rear 53/53 Exhaust close front/rear 12/12 Intake duration front/rear 220/233 Exhaust duration front/rear 245/245 Lift front/rear .389/.391