Pontiac V8 Xtreme Hyd. Roller Cam XR276HR-10

The COMP CAMS Pontiac V8 Xtreme Hydraulic Roller Cam XR276HR-10 is a high-lift, long-duration camshaft engineered for naturally aspirated Pontiac V8 engines seeking aggressive mid-range and peak horsepower gains. This hydraulic roller cam combines Xtreme Energy technology with modern roller follower design, delivering increased valve lift and extended duration to maximize air charge while maintaining street-friendly idle characteristics and reliable hydraulic lifter operation across the full RPM band.

With 0.502-inch intake lift and 0.510-inch exhaust lift, the XR276HR-10 opens and closes the valves with greater aggression than stock profiles. The 276-degree intake and 282-degree exhaust duration (measured at 0.050-inch valve lift) provide substantial overlap, optimizing power production in the 1800 to 5600 RPM range. The 110-degree lobe separation angle balances scavenging efficiency and intake charge density. COMP CAMS' precision-ground, induction-hardened profile ensures consistent lobe geometry and extended longevity in both street and strip applications.

This camshaft is designed for Pontiac V8 engines equipped with hydraulic roller lifters, making it an ideal upgrade for muscle car restoration, street rod builds, and performance restorations where higher output and refined drivability are priorities. It functions seamlessly with factory and aftermarket aluminum heads, iron blocks, and modern fuel injection systems. The cam works with existing valve train components, reducing installation costs while delivering measurable torque and horsepower increases across the powerband.

Pontiac V8 camshaft selection depends on intended use, compression ratio, and induction method. The Xtreme profile occupies the aggressive end of the performance spectrum—more radical than stock or mild performance grinds, but less extreme than dedicated race-only designs. Proper valve spring pressure, pushrod geometry, and rocker arm geometry validation are essential to safe, reliable operation with any performance camshaft.