American Muscle 1955 - 1981 Pontiac 265-455 Hyd Flat Tappet 1700 to 5200 Cam All Howards Cams use the highest-grade race quality cores available. All hydraulic and mechanical flat tappet camshafts are 100% Rockwell checked and Parkerized to ensure the highest quality control standards available anywhere. Howards Cams are manufactured on dedicated high precision CNC cam grinding machines. Most Howards Cams are packaged and shipped in our unique, hard, high impact plastic reusable cases. This ensures that the high quality camshaft that went into the case comes out in the same condition, when delivered, as when it was packed. Lift: .407 / .411, Duration @ .050: 200 / 210, Centerline: 106, American Muscle, Near duplicate of the Pontiac Tri-Power 318HP/389 cam (GM #529472).