Cam And Lifter Kit For a Chev Marine 454 7.4L Non Roller Standard Rotation Engine. 1-Camshaft (brand New) 16-Hydraulic Lifters Non Roller (brand new) 1-Timing chain Kit 3 Piece Double Roller Heavy Duty (brand new) Specs on Camshaft. GM MARINE 7.4L / 454 OHV V8 16V Chev. Big Block 4.250 Bore.