COMP Cams Camshaft Kit CS XR274 R-10

This COMP Cams K-Kit gives you everything you need to upgrade your Chevrolet Gen 1 Small Block engine. Inside this box, you'll find the XR274 R-10 solid roller camshaft, a full set of lifters, valve springs, retainers, valve locks, valve stem seals, and a timing chain set. It also includes assembly lube and decals to help with the installation. This kit is designed for power touring applications and is known for its rough idle, which is typical for aggressive solid roller cams. It requires a torque converter with a 2500+ stall speed but is designed to be relatively easy on the rest of your engine components.

The XR274 R-10 camshaft is a solid roller type, meaning it uses roller lifters to reduce friction and allow for more aggressive cam profiles. This particular cam has an intake duration of 236 degrees and an exhaust duration of 242 degrees at 0.050 inch lift, with 0.571 inches of lift on the intake and 0.590 inches on the exhaust. These specifications are well-suited for building significant power, especially in the mid to upper RPM range, making it a popular choice for performance street and drag racing builds. It's important to note that this kit is intended for engines that do not have factory roller camshafts; you'll need to verify your block's configuration, as GM transitioned to roller cams gradually from the mid-1980s onward. Early Gen 1 Small Blocks like the 265, 283, 327, and 350 are typically flat tappet, but later versions might be factory roller. If you're unsure, removing the intake manifold or timing cover is the best way to confirm.

This kit fits a wide range of Chevrolet Gen 1 Small Block engines, including popular displacements like the 350, 400, and 327, found in vehicles such as the Chevrolet C10, Camaro, and Caprice. It's crucial to confirm your specific engine's configuration, especially for 1985 and newer blocks, to ensure proper fitment. For 1955-1957 Chevrolet 265 engines, a specific oiling groove on the fifth cam journal is required. Please consult the manufacturer's instructions for detailed installation procedures and any specific requirements for your application.