S&S Cycle Cam - H-Grind - Alternator Style - Big Twin '70-'77705629707 Product Description OEM specification replacement hydraulic camshaft with unique front and rear timing specifications H grind is a dead on reproduction of the stock cams used in '48 '84 Big Twins Perfect for repair and restoration of 74" and 80" engines Notes 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.