COMP Cams Camshaft CS 47S 312-R8 .900 B

If you're building a serious drag racing engine for your Chevrolet Small Block, a camshaft like this COMP Cams CS 47S 312-R8 .900 B is a critical piece. This solid roller camshaft is specifically tuned for larger displacement engines, typically 400 cubic inches and up, when paired with good cylinder heads and high compression. It features a .900-inch base circle, which is important for clearance in certain engine builds, and it's designed as a 4/7 swap camshaft. This means the firing order is altered to improve exhaust scavenging and reduce crankshaft stress, a common technique in high-performance drag racing applications.

This camshaft is a well-built component designed for aggressive performance. The 279/286 degree intake/exhaust duration at .050 lift provides significant valve lift and duration, suitable for engines that will see high RPM operation. It's important to note that this camshaft is intended for older Small Block Chevys, specifically Gen 1 engines. It does not fit LT1/LT4 engines or factory roller Small Blocks from 1985 and newer, as those applications often have different lifter and block designs. Always double-check your specific engine block's configuration, especially if it's a mid-80s or newer build, to ensure compatibility. Early 1955-1957 engines also have specific oiling groove requirements that this particular part number does not accommodate.

This COMP Cams camshaft fits a wide range of Chevrolet Gen 1 Small Block engines found in vehicles like the Chevrolet Camaro, Corvette, and C10 trucks, as well as many other makes and models. Because it's a solid roller design, it requires specific valve springs, lifters, and pushrods that can handle the higher lift and RPMs. Ensure you have the correct supporting valvetrain components to match the demands of this camshaft for optimal performance and reliability.