COMP Cams Camshaft CB XR300HR-10

If you're looking to wake up your Chevrolet Big Block engine, this COMP Cams Xtreme Energy camshaft is a solid option. This camshaft is designed for pro street and bracket racing applications, aiming to give you more power and responsiveness without making the car undrivable. It works by opening the valves quicker and holding them open longer, which means more air and fuel can get into the cylinders and more exhaust can get out, ultimately raising torque and horsepower.

The XR300HR-10 profile is a hydraulic roller camshaft, which is generally more efficient and can handle higher lift than older flat tappet designs. COMP Cams designed this grind to provide noticeable gains in the mid-range and upper RPMs, but they also made sure it still makes enough vacuum to run accessories like power brakes. For best results, this cam pairs well with a higher compression ratio (10:1 or more), a 3500+ RPM stall torque converter, a good intake manifold, headers, and a free-flowing exhaust system.

This camshaft is intended for Chevrolet 396 to 454 cubic inch Big Block engines that originally came with flat tappet camshafts. It's a popular choice for vehicles like the Chevrolet Chevelle, Camaro, and Corvette from the late 60s through the mid-70s, as well as many truck and full-size car applications from that era. While it's designed for street use, it's best suited for builds that lean towards performance, like pro street or bracket racing.