COMP Cams Cam & Lifter Kit CS XR274

If you're building a performance street machine or a power touring vehicle based on a Chevrolet Gen 1 Small Block engine, this COMP Cams Xtreme Energy XR274 Cam and Lifter Kit is designed to help you achieve significant power gains. This kit replaces your stock flat tappet camshaft and lifters with a solid roller setup, which is known for its ability to handle higher RPMs and aggressive valve events. It’s a popular choice for those looking to extract more performance from engines like the 350, 327, or 400 cubic inch V8s, but it’s important to note that it does not fit factory roller blocks from 1985 and newer, or any LS-based engines.

The XR274 camshaft features a 236-degree intake and 242-degree exhaust duration at .050 inch lift, paired with a .571-inch intake and .590-inch exhaust lift. This aggressive profile is intended for engines that can support it, requiring a torque converter with at least a 2500 RPM stall speed to keep the engine in its power band. While it offers a rough idle characteristic that many enthusiasts appreciate for its aggressive sound, it's also designed to be relatively easy on other engine components. The kit includes the camshaft, solid roller lifters, assembly lube, and instructions, providing a solid foundation for your engine's top-end performance upgrade.

When installing this kit, remember that it's crucial to confirm your engine block is a flat tappet design, as this kit is not compatible with factory roller blocks. For 1955-1957 Chevrolet 265 engines, a specific oiling groove on the 5th cam journal is required. This kit is a significant upgrade for your engine's breathing capabilities, and while it’s built for performance, it’s also designed with durability in mind for its intended use.