SBC Nitrous HP Cam NX268 H-13

The COMP Cams SBC Nitrous HP Cam NX268 H-13 is a hydraulic flat-tappet camshaft engineered for small-block Chevrolet engines running on nitrous oxide injection systems. This cam delivers a 268-degree intake duration and 286-degree exhaust duration with a 113-degree lobe separation angle, optimized to maximize power output in the 2000–6200 RPM operating band. The 0.477-inch intake lift and 0.490-inch exhaust lift specifications are designed to feed nitrous-assisted combustion events with adequate cylinder charge while maintaining reliable valve train control under boost conditions.

Nitrous HP cam profiles are tuned for engines running power-adder systems, where fuel mixture and ignition timing adjustments are calibrated around a specific cam timing curve. The 113 LSA (lobe separation angle) centers overlap to take advantage of the increased air density from nitrous charge, reducing cylinder-to-cylinder variation and supporting consistent detonation margins. Hydraulic flat-tappet design offers cost-effective reliability compared to roller-cam systems while maintaining adequate load-carrying capacity for nitrous applications. This profile is compatible with stock or mildly modified small-block Chevy architecture, making it a practical upgrade for enthusiasts stepping into nitrous performance without major engine teardown.

This cam suits owners building nitrous-fed small-block Chevy engines for street performance, bracket racing, or weekend track duty. It is most effective on engines with fuel and ignition management calibrated for nitrous operation, carburetor jetting matched to the system output, and supporting modifications like hardened pushrods, quality valve springs, and proper lifter oiling. COMP Cams precision manufacturing and proven Nitrous HP line history make this a recognized choice among Chevy performance builders seeking predictable, documented performance in the nitrous power range.