SBC Extreme Energy Cam XE256H-10

The COMP Cams SBC Extreme Energy Cam XE256H-10 is a hydraulic flat tappet camshaft engineered for small block Chevy engines seeking aggressive idle quality and high-RPM power delivery. This camshaft is purpose-built for street and strip applications where peak power occurs well into the upper RPM range, making it ideal for enthusiasts building or upgrading high-output small block Chevy platforms.

The XE256H-10 carries a 256-degree intake duration and 268-degree exhaust duration with a 110-degree lobe separation angle, producing intake and exhaust valve lifts of 0.447 and 0.454 inches respectively. This specification window targets peak horsepower between 5,200 RPM and full throttle, with stable idle characteristics supported by the hydraulic flat tappet design—a proven, low-cost rocker arm interface requiring no special valve train modifications on stock or mildly modified block configurations. The broad RPM operating window (1,000 to 5,200 RPM) suits both cruise-ability and race-focused builds.

This camshaft is targeted at small block Chevy builders running carburetor or fuel-injected induction systems on street rods, muscle cars, and weekend track vehicles. The Extreme Energy line from COMP Cams is recognized for combining street manners with strong top-end horsepower, making it a pragmatic choice for builds prioritizing usable power across a wide band rather than peak dyno numbers. Installation requires proper valve train clearance verification and quality rocker arm geometry to ensure reliable long-term operation.

Small block Chevy platforms remain the foundation of countless hot rod and performance rebuild projects, and camshaft selection is critical to achieving target power characteristics. The SBC Extreme Energy Cam XE256H-10 bridges aggressive cam timing with practical hydraulic operation—a combination that delivers measurable gains without requiring exotic machine work or extensive valve train investment.