COMP Cams Camshaft Kit CS 299T HR-107 B

If you're building a serious street/strip machine based on a Chevrolet Gen 1 Small Block engine, this COMP Cams Big Mutha' Thumpr camshaft kit is designed to make some serious noise and power. This kit is built around the CS 299T HR-107 B hydraulic roller camshaft, featuring a 243/257 degree duration split, which is aggressive enough to deliver a very rough idle and noticeable performance gains when paired with the right supporting components. It’s important to note that this camshaft is intended for engines with at least 9.5:1 compression and requires a torque converter with a stall speed of 2800 RPM or higher to perform optimally.

This kit is a comprehensive package, meaning you get the camshaft along with all the necessary valvetrain components to ensure proper installation and function. COMP Cams is well-known for its performance valvetrain parts, and this kit reflects that reputation. The hydraulic roller design means less friction and more efficient operation compared to older flat-tappet designs, allowing for more aggressive cam profiles. To get the most out of this camshaft, you'll also need to ensure your engine is equipped with a suitable intake manifold, performance gears, and headers, as these work in conjunction with the cam to maximize airflow and power output.

This camshaft kit fits a wide range of Chevrolet Gen 1 Small Block engines, including popular displacements like the 350, 400, and 327. However, it's crucial to verify your specific engine's configuration. This kit does not fit LT1/LT4 engines or factory roller small blocks from 1985 and newer. You may need to remove the intake manifold or timing cover to confirm if your block is a factory roller or a flat-tappet design. For early 1955-1957 Chevrolet 265 engines, a specific oiling groove on the 5th journal is required; contact COMP Cams for details on this specific application.