COMP Cams Camshaft Kit CS XM 290H-12

This COMP Cams Xtreme Marine camshaft kit is built around a hydraulic flat tappet camshaft featuring 246 degrees of intake duration and 256 degrees of exhaust duration. This specific camshaft profile is designed for applications like jet boats with an A impeller, a 9.5:1 compression ratio, and headers, making it well-suited for bracket racing and high-performance street use. It fits a wide range of Chevrolet Gen 1 Small Block engines, including popular displacements like the 350, 400, and 327, but it's crucial to verify your engine uses a flat tappet setup, as many later models (mid-80s and newer) transitioned to factory roller camshafts.

This is a complete K-Kit, meaning it includes everything you need to swap out your old camshaft and related components. Beyond the camshaft itself, you'll find hydraulic lifters, valve springs, retainers, valve locks, and valve stem seals. To ensure proper timing and installation, the kit also bundles a timing chain set and assembly lube, which is particularly important for flat tappet applications. COMP Cams also includes decals and detailed instructions to guide you through the process.

When considering this camshaft, remember it's intended for performance builds that utilize headers and a healthy compression ratio. While it fits many Chevrolet Small Block engines from 1955 through the mid-1990s, it's essential to confirm your specific engine's configuration. For instance, 1955-1957 Chevrolet 265 engines require a specific oiling groove on the 5th cam journal, and you'll need to remove the intake or timing cover to definitively identify if your block is a factory roller or flat tappet design. This kit is not CARB approved and cannot be shipped to California.