SBC Hydraulic Camshaft .420/.443 Lift

The SBC Hydraulic Camshaft .420/.443 Lift by Melling is a purpose-built performance upgrade for small-block Chevrolet engines seeking improved breathing and valve lift. This hydraulic roller camshaft is engineered for enthusiasts and builders who want to extract more power without sacrificing streetability or reliability. Whether you're building a classic hot rod, a weekend track car, or upgrading an existing small-block platform, this cam delivers the lift and timing geometry needed for measurable horsepower gains across the mid to upper RPM range.

The .420-inch intake and .443-inch exhaust valve lift specification represents a significant step up from stock profiles, allowing cylinders to fill and evacuate more efficiently at higher engine speeds. Melling's hydraulic design uses a conventional flat-tappet or roller-compatible lobe profile that activates adjustable hydraulic lifters, maintaining precise valve clearance across varying engine temperatures and load conditions. This engineering approach eliminates the need for manual valve-lash adjustment and reduces wear on valve train components, making it ideal for both street and moderate competition applications. The cam's lift values work in conjunction with duration and lobe separation angle to create a torque curve suited to mid-range responsiveness rather than extreme top-end RPM builds.

This SBC hydraulic camshaft is best suited for engine builders upgrading stock or mildly modified small-block Chevrolet applications with compatible cylinder heads and intake manifolds. Proper installation requires attention to timing chain accuracy, lifter preload, and rocker arm geometry to ensure the cam profile operates within design specifications. Before purchasing, verify that your engine uses hydraulic lifters and that your valve train components—including pushrods, rocker arms, and valve springs—are rated for the increased lift and spring pressures this cam demands. Pairing this camshaft with a quality intake manifold, carburetor or fuel injection, and exhaust system will maximize the performance gains and help you realize the full potential of this upgrade.