BBC Xtreme Hydraulic Cam XM288H

The COMP Cams BBC Xtreme Hydraulic Cam XM288H is a high-performance camshaft engineered for big-block Chevy marine engines requiring aggressive valve timing and lift characteristics. This hydraulic flat-tappet camshaft delivers 0.570-inch intake and 0.575-inch exhaust lift across a 288/304-degree duration profile with a 112-degree lobe separation angle, designed to optimize power delivery in the 2500 to 6500 RPM operating band typical of marine propulsion applications.

The XM288H's specifications translate to measurable performance advantages in marine service. The asymmetrical lift profile—slightly higher on the exhaust side—supports efficient scavenging of combustion gases in big-block Chevy engines, improving volumetric efficiency across mid to upper RPM ranges where marine engines spend sustained operating time. Hydraulic actuation provides automatic valve clearance compensation, eliminating the need for periodic adjustment and reducing maintenance complexity on saltwater or freshwater vessels where corrosion and vibration stress cam train components. The 112-degree LSA promotes stable idle quality while supporting responsive mid-range acceleration when throttling up from cruise.

This camshaft suits boaters running stock or mildly modified big-block Chevy engines who prioritize reliability and part availability over extreme RPM capability. Serious offshore anglers, commercial fishing operations, and weekend cruisers benefit from the Xtreme Marine series' proven track record in saltwater environments. The XM288H pairs with factory-style pushrods, hydraulic lifters, and stock valve springs, making it a straightforward upgrade path for existing engines without requiring extensive machine work or parts replacement.

COMP Cams positions the Xtreme Marine line as a middle ground between stock marine camshafts and extreme-duration race profiles. The 288/304 duration split is common in production marine engines, meaning replacement timing components and pushrods are readily available through marine suppliers and general automotive sources, an important consideration for remote boating locations.