COMP Cams Camshaft CS 291T HR-107 MT Th

Starting with the 235/249 degree intake/exhaust duration at .050 lift, this COMP Cams Mutha' Thumpr camshaft is built for serious performance on Small Block Chevy engines with factory roller camshafts. It's designed to give you that unmistakable, aggressive, hard-hitting exhaust note at idle that muscle car and street rod owners crave. Beyond the sound, this camshaft is engineered to unlock significant horsepower gains and broaden your engine's torque curve, making your vehicle feel much more responsive.

This isn't just a drop-in part; it's part of a performance package. The early intake valve opening and extended exhaust duration create a substantial amount of valve overlap, which is key to achieving that race-car-like idle. To make sure your drivetrain can keep up and keep the engine in its optimal powerband, you'll need an aftermarket torque converter with a stall speed of at least 2500 RPM, along with lower gear ratios. You'll also want to ensure you have a performance intake, headers, and at least 9:1 compression to get the most out of this cam. Because it typically reduces vacuum at idle, you'll likely need to add a vacuum canister, pump, or hydroboost system if your vehicle relies on vacuum for power brakes.

This camshaft fits a wide range of vehicles from the late 1980s through the mid-1990s, including popular models like the Chevrolet Camaro, Corvette, and various C/K series trucks. It's a well-built component for those looking to transform their engine's character and performance, but be aware it's not CARB approved and cannot be shipped to California.