COMP Cams Camshaft CS 321QnHR-8

This COMP Cams CS 321QnHR-8 hydraulic roller camshaft is built with a 267/275 duration profile, making it a strong choice for larger displacement Chevrolet Small Block engines. It's specifically tuned for drag racing applications where maximum power output is the goal.

To get the most out of this camshaft, it requires a high compression ratio of 11.5:1 or higher and a torque converter with at least a 4500 RPM stall speed. A critical installation note is that this camshaft must be used with a Melanized or Nitrided distributor gear. Using a standard cast iron or steel gear without this surface treatment will void the warranty and return policy, so be sure to check your distributor gear compatibility before installation.

This camshaft fits a wide range of Chevrolet Gen 1 Small Block engines, including popular displacements like the 350 and 400 cubic inch variants. It's important to verify your specific engine's configuration, as factory roller camshafts were gradually introduced from the mid-80s onward. This camshaft is not compatible with LT1/LT4 engines or factory roller small blocks from 1985 and newer. For early 1955-1957 Chevrolet 265 engines, ensure there is an oiling groove on the 5th cam journal.