COMP Cams Camshaft Kit CS XR270HR-12

If you're looking to significantly upgrade the performance of your Chevrolet Gen 1 Small Block engine, this COMP Cams Camshaft Kit, part number K12-417-8, is a serious consideration. This kit is built around the XR270HR-12 hydraulic roller camshaft, designed to give your engine a noticeable idle and excellent throttle response, especially in the mid-range. It's a popular choice for a wide variety of applications, from boats to muscle cars, and is engineered to work with engines like the 350, 327, and 305 cubic inch displacements.

This isn't just a camshaft; it's a complete package to ensure a smooth and successful installation. Inside this kit, you'll find the camshaft itself, a set of hydraulic roller lifters, valve springs, retainers, valve locks, and valve stem seals. COMP Cams also includes a timing chain set to get your valvetrain synchronized correctly, plus assembly lube and decals. This comprehensive approach means you have most of the critical components needed to perform a full camshaft upgrade, saving you time and ensuring compatibility between parts.

It's important to note that this kit is specifically for Gen 1 Small Blocks that do not have a factory roller camshaft setup from 1985 or newer. Many earlier engines, particularly those from the 1950s through the early 1980s, used flat tappet camshafts. You may need to remove the intake manifold or timing cover to confirm your engine's configuration before ordering. For 1955-1957 Chevrolet 265 engines, a specific oiling groove on the fifth cam journal is required; contact COMP Cams for details if this applies to your build.