Thumpr Hydraulic Flat Tappet Camshaft and Lifter Kit Single-BoltLift .486"/.473"Duration 279/296RPM Range 2000-5800 Thumpr: High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle.273, 360, 318, AMC, Dodge, Mopar, Plymouth, Dart, Road Runner, Charger, Challenger, 383, 400, 440, 426, HEMI, 426 Wedge, 426 HEMI, RB, B, HEMI, 392, Chrysler, LAHigh performance street, stock converter ok, best with 2000+ stall and gears. Choppy/thumping idle.