SBC Extreme Energy Cam XE274H-10

The COMP Cams SBC Extreme Energy Cam XE274H-10 is a hydraulic flat-tappet camshaft engineered for small block Chevy engines seeking aggressive naturally aspirated performance. This XE274H-10 cam delivers 0.490 inches of lift on both intake and exhaust sides, with a 274-degree intake duration and 286-degree exhaust duration, operating across a broad 1800–6000 RPM powerband. The 110-degree lobe separation angle (LSA) positions this camshaft in the aggressive street-performance segment, optimized for carbureted and fuel-injected small block platforms requiring dynamic mid-range torque and top-end responsiveness without sacrificing drivability at lower RPMs.

Hydraulic flat-tappet design eliminates complexity and cost compared to roller systems while maintaining proven reliability in street and light competition environments. The asymmetric lift profile—0.490 intake, 0.490 exhaust—reflects COMP Cams' engineering approach to balancing intake charge velocity with exhaust scavenging efficiency. The 110 LSA delivers overlap characteristics that favor responsive throttle transition and cylinder-filling efficiency, making this cam particularly effective in 350–454 cubic-inch applications where mid-range torque is a priority. Small block Chevy owners running conventional valve trains benefit from the straightforward installation and proven track record of flat-tappet technology in this application class.

This camshaft targets engine builders and enthusiasts pursuing increased output without full cylinder head porting or radical timing events. Street rods, truck restorations, weekend track cars, and carbureted performance builds represent typical installations. The XE274H-10 operates within the thermal and mechanical envelope of stock small block valvetrain components, allowing straightforward bolt-in retrofit into existing engine bays. Users should verify that existing pushrods, rocker arms, and lifters remain within tolerance and confirm that carburetor or fuel injection tuning accommodates the altered breathing characteristics this cam introduces.

COMP Cams' Extreme Energy line occupies the mainstream performance tier within the small block Chevy aftermarket—more aggressive than stock or mild OEM upgrades, yet conservative compared to full-race bumpstick profiles. The SBC Extreme Energy Cam XE274H-10 balances street manners with measurable power gains, making it a popular choice for buyers seeking noticeable improvement without extreme complexity or cost.