Big Daddy Rattler 1955 - 1981 Pontiac 265-455 Hyd Flat Tappet 2400 to 5600 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: .507 / .495, Duration @ .050: 243 / 251, Centerline: 103, Big Daddy Rattler, Rough idle, Pro street or street/strip, Needs 9.5:1+ compression & 2800+ stall converter.