SBC Hydraulic Camshaft X4270H

The COMP CAMS SBC Hydraulic Camshaft X4270H is a purpose-built hydraulic flat-tappet camshaft designed for small-block Chevrolet engines seeking balanced street performance with proven reliability. This part number 12-243-3 delivers 0.480-inch intake and 0.498-inch exhaust lift across a 270/278-degree duration profile, engineered to maximize low-to-mid-range torque and drivability without sacrificing top-end power delivery.

The 111-degree lobe separation angle (LSA) creates an efficient overlap window that suits hydraulic operation, where valve actuation depends on oil pressure rather than mechanical preload. With a 1800–6000 RPM operating range, this camshaft is optimized for engines that need usable power from cruising speeds through aggressive driving. The hydraulic flat-tappet design eliminates the need for valve clearance adjustment and reduces maintenance complexity compared to solid lifter profiles, making it ideal for street-driven and lightly modified small-block platforms.

This camshaft is engineered for small-block Chevy 262, 283, 302, 305, 327, 350, and 400 cubic-inch engines equipped with stock or aftermarket hydraulic roller or flat-tappet valvetrain systems. Buyers selecting this profile typically seek a noticeable performance upgrade from factory specifications without requiring extensive engine modifications, valve spring changes, or fuel system tuning. The COMP CAMS reputation for quality grind accuracy and durability makes this a trusted choice among engine builders and enthusiasts balancing street manners with responsive acceleration characteristics.