COMP Cams Camshaft CS 313QnHR-8

This is the COMP Cams CS 313QnHR-8 drag race hydraulic roller camshaft, designed for Chevrolet Small Block Gen 1 engines. It's built to give you a strong top-end power band, especially in larger displacement engines like 350 cubic inches and up. To get the most out of this camshaft, you'll want to pair it with a compression ratio of 11:1 or higher and cylinder heads that can keep up with the increased airflow. This camshaft is a popular choice for those looking to build a serious drag racing machine or a powerful street/strip engine.

The CS 313QnHR-8 features a 260-degree intake and 270-degree exhaust duration, making it well-suited for engines that spend a lot of time at higher RPMs. It's a hydraulic roller design, which means it offers reduced friction and wear compared to flat tappet cams, allowing for more aggressive profiles and better performance. COMP Cams has optimized this camshaft for use with Melanized or Nitrided distributor gears. It's critical to use one of these treated gears, as using a standard cast iron or steel gear can lead to premature wear and will void the warranty.

This camshaft fits a wide range of Chevrolet Gen 1 Small Block engines, including popular displacements like the 262, 283, 305, 327, 350, and 400. However, it's important to note that it is not compatible with factory roller small blocks from 1985 and newer, nor is it for LS-based engines. If you're working on a 1955-1957 265 engine, you'll need to ensure the fifth cam journal has an oiling groove. Always confirm your block type by removing the intake manifold or timing cover if you're unsure whether it's a factory roller or flat tappet design.