COMP Cams Camshaft CB 47S 318Rxh-16

This COMP Cams camshaft features a 285-degree intake and 312-degree exhaust duration at .050 lift, with a .632-inch intake and .632-inch exhaust lift. It's a solid roller camshaft designed specifically for Chevrolet Big Block engines, including the 396, 427, and 454 cubic inch displacements, originally equipped with flat tappet camshafts. The 4/7 cylinder firing order swap is a notable design choice that helps reduce crankshaft stress and improve overall engine balance, making it a popular modification for drag racing applications.

This camshaft is built for performance, offering a significant increase in airflow and power potential over stock components. The solid roller design means it utilizes roller rockers and lifters, which reduce friction and allow for more aggressive valve events compared to flat tappet designs. This translates to better high-RPM performance and a more responsive engine. It's important to note that this camshaft is intended for drag race use and requires a compatible valvetrain setup, including roller lifters, pushrods, and valve springs that can handle the increased lift and spring pressures.

When installing this camshaft, ensure your engine block is compatible. Specifically, 1965-1966 396 Big Block engines have an oiling groove in the rear journal that this particular camshaft does not accommodate. If your engine falls into that specific early range and requires that groove, you'll need to contact COMP Cams directly for a different part number. For other compatible Chevrolet Big Block applications, this camshaft offers a substantial performance upgrade for drag racing builds.