Camshaft - Thumpr - Hydraulic Flat Tappet - Lift 0.491 / 0.476 in - Duration 279 / 296 - 107 LSA - 2000 / 5800 RPM - Small Block Ford - Each

T 227/241 HFT221-302

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.

Additional Information

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

Application Summary

Fits Ford 221, 255, 260, 289 and 302 Small Block

Part Type

Engine Camshaft

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Product Details

Product Downloads

#	Document Type	Download
1.	Catalog

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Reference Information

Camshaft, Hydraulic Flat Tappet, Advertised Duration 279/296, Lift .491/.476, Ford,. Small Block, Kit

COMP Cams is bringing the musclecar sound back, and it's nastier than ever! Few things grab our attention at a car show or cruise-in like a thumping, high performance idle. In fact, one of the most frequent questions from customers is, "What camshaft will give my car that mean-sounding idle?" For the performance and sound you demand, COMP Cams engineers introduce the Thumpr camshafts—a new series of hydraulic flat tappet cams. The lobe profile and grind characteristics of Thumprs use a combination of early exhaust valve opening, long exhaust duration, and a generous amount of intake and exhaust overlap—to maximize the rough-idling characteristics of the cams. They give you a seriously aggressive exhaust note without negatively impacting the power output or streetability of the engine. Thumpr camshafts are available in several grind profiles; each one will produce a rough, racy exhaust note and impressive amounts of horsepower and torque within a different rpm range.