BBC Xtreme Hyd Roller Camshaft XR270HR-13

The COMP Cams BBC Xtreme Hydraulic Roller Camshaft XR270HR-13 is a high-lift hydraulic roller camshaft engineered specifically for big block Chevrolet engines. Delivering 0.510-inch lift on both intake and exhaust, with 270/276-degree duration and a 113-degree lobe separation angle, this Gen VI camshaft is optimized for maximum power in the 1,500–5,500 RPM operating range. It represents an ideal choice for street performance and moderate racing applications where consistent valve actuation and reliability are essential.

The hydraulic roller design eliminates complex valve train adjustments while providing the durability and precision that modern performance engines demand. The 270/276 duration split is asymmetrical—slightly more exhaust duration than intake—to optimize scavenging and reduce overlap issues at lower RPM levels where street-driven engines spend most of their time. The 113 LSA (lobe separation angle) balances cylinder pressure and torque characteristics across the operating band, resulting in responsive mid-range performance without sacrificing top-end capability. Hydraulic rollers absorb shock loads more effectively than flat-tappet designs, extending service life and reducing wear on the entire valve train.

This camshaft is intended for street and performance builders working on big block Chevy mills (BBC) who need predictable, repeatable power without the complexities of solid cam conversions. The RPM range suits both cruising and spirited driving, making it suitable for hot rods, muscle cars, and performance street engines that demand daily reliability. Builders using this camshaft typically pair it with matching valve springs, rocker arms, and pushrods rated for the 0.510-inch lift specification to ensure proper clearance and valve actuation throughout the rev range.