Hydraulic-Choppy idle, increased compression advised. Needs 2500 stall and lower gear, use headers.Lifter Type: Hydraulic LifterEngine Family: Pontiac 265-455 c.i. 8 cyl. 1955-1981Camshaft Family: MagnumT Hydraulic Flat Tappet CamshaftsVehicle Fitments: Year Make Model...