COMP Cams Camshaft CB XR271HR-12

COMP Cams is well-known for performance engine components, and their Xtreme Energy line is a popular choice for enthusiasts looking to get more out of their engines. This particular camshaft, the XR271HR-12, is a solid roller design specifically for Chevrolet Big Block engines ranging from 396 to 454 cubic inches, originally equipped with flat tappet camshafts.

This camshaft features a 224-degree intake duration and 232-degree exhaust duration at 0.050 inch lift, with a 112-degree lobe separation angle. It's designed to work with a Melanized or Nitrided distributor gear. Using cast iron or steel distributor gears without these surface treatments can lead to premature wear and will void the warranty, so it's important to use the correct gear to ensure longevity and performance.

This camshaft is optimized for engines that originally came with flat tappet camshafts. If your 1965-66 396 Big Block has an oiling groove in the rear journal, this specific part number will not fit. For those specific applications, you'll need to contact COMP Cams directly for a special order camshaft. This part is not CARB approved and cannot be shipped to California.