COMP Cams Camshaft FC 283Th R7 Thumper R

The COMP Cams Thumpr camshaft, specifically the FC 283Th R7 grind, features a 227-degree intake and 241-degree exhaust duration at .050 lift, with 113-degree lobe separation. This hydraulic roller camshaft is designed for Ford 351 Cleveland, 351 Modified, and 400 Modified engines, offering a distinct, aggressive idle that sounds like a race car. It's a popular choice for muscle cars and street rods looking for that signature choppy exhaust note.

This camshaft is engineered to create optimum engine overlap, which is key to achieving that hard-hitting idle. Beyond the sound, it's built to deliver notable horsepower gains and a broad torque curve, making your vehicle feel more responsive. To best utilize the powerband this camshaft unlocks, it's recommended to pair it with an aftermarket torque converter rated for 2000 RPM or higher, along with a lower gear ratio in your differential. You'll also want to plan for a vacuum canister, pump, or hydroboost system, as this camshaft typically reduces idle vacuum, which can affect power brake operation.

This camshaft fits a wide range of Ford and Mercury vehicles from the late 1960s through the mid-1980s, including popular models like the Ford Mustang, Ford F-150, and Mercury Cougar. While it offers a stock converter option, the full benefits are realized with the recommended drivetrain upgrades. Ensure your vehicle's drivetrain is prepared to handle the increased performance and altered vacuum characteristics.