COMP Cams Camshaft OL 279T H-107 T Thumper - 42-600-5

Thumpr 226/241 Hydraulic Flat Cam for Oldsmobile 260-455

Application: Fits 1967+ Oldsmobile 260, 307, 350, 403, 400, 425 and 455 V8

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

Thumpr 226/241 Hydraulic Flat Cam for Oldsmobile 260-455. High performance street, stock converter ok, best with 2000+ converter and Gears. Choppy/thumping idle.

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.