1955 - 1981 Pontiac 265-455 Mech Flat Tappet 2500 to 6500 Camshaft & Lifter Kit 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: .535 / .550, Duration @ .050: 248 / 254, Centerline: 102, Street/Strip, Powerful through entire rpm range.