COMP Cams Camshaft C409 47S283THR8 - 48-600-10

Thumpr 4/7 Swap 227/241 Hydraulic Roller Cam for Chevrolet 348-409

High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle.

Thumpr 4/7 Swap 227/241 Hydraulic Roller Cam

Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series' early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes.

• Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.
• Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods.
• Best with aftermarket converters and more rear gear.