351C, solid flat tappet cam with lift of 0.640. 7/16 screwed-in studs. Any opinions on Rock Arms? PRW vs. Harland Sharp vs. other? -------------- next part -------------- 351C, solid flat tappet cam with lift of 0.640. 7/16 screwed-in studs. Any opinions on Rock Arms? PRW vs. Harland Sharp vs. other?