COMP Cams Camshaft Kit CS XR258HR-10

If you're looking to wake up your Chevrolet Small Block Gen 1 engine, this COMP Cams Xtreme Energy CS XR258HR-10 hydraulic roller camshaft kit is a solid option. This kit is designed for a wide range of classic Chevy V8s, including popular displacements like the 350, 400, and even smaller ones like the 283 and 305. It's important to note that this kit is for engines originally equipped with a flat tappet camshaft, or for those who are converting a factory roller block to a flat tappet setup. It will not work with factory roller camshafts from 1985 and newer, nor will it fit any LS-based engines.

This isn't just a camshaft; it's a complete package to get your engine breathing better. Inside the box, you'll find the XR258HR-10 camshaft itself, which features a 200/206 degree duration at .050 lift, designed to offer improved performance without being overly radical for street use. COMP Cams also includes a set of hydraulic roller lifters, valve springs, retainers, valve locks, and valve stem seals, ensuring you have all the critical valvetrain components. To make the installation process smoother, the kit also comes with a timing chain set and assembly lube, along with instructions and decals to show off your upgrade.

When installing this kit, remember to verify your engine's original camshaft type. Many engines from the mid-80s onward gradually transitioned to factory roller setups, so a quick check of the intake manifold or timing cover area will confirm if you have a flat tappet or roller block. For specific early 265 engines from 1955-1957, ensure there's an oiling groove on the fifth cam journal, or contact COMP Cams for guidance. This kit is a comprehensive way to achieve improved performance and a more aggressive engine note.