Thumpr camshafts use a combination of an early exhaust valve opening, a long exhaust duration, and a generous amount of intake and exhaust overlap to maximize the rough-idling characteristics of...
Thumpr camshafts use a combination of an early exhaust valve opening, a long exhaust duration, and a generous amount of intake and exhaust overlap to maximize the rough-idling characteristics of the cams. This gives you a seriously aggressive exhaust note without negatively impacting the power output or streetability of the engine.
Specification:
Lifter Type: Hydraulic Flat Tappet
RPM Range: 2,500-6,400
Valve Lift (in.): 0.531 Intake /0.515 Exhaust
Duration @ .050 in. (Deg): 242 Intake /257 Exhaust
