Magnum Hyd. Roller Cam - BBC 270HR

The Magnum Hydraulic Roller Cam – BBC 270HR by COMP Cams is engineered for big-block Chevrolet engines demanding aggressive street and strip performance without sacrificing daily reliability. This hydraulic roller design is purpose-built for builders and enthusiasts who want to maximize horsepower and torque while maintaining tight valve train tolerances and reducing wear on lifters and pushrods. The 270HR designation indicates a solid lift profile optimized for engines in the 5,000–7,000 RPM power band, making it ideal for fuel-injected BBC platforms, vintage muscle builds, and modern restorations seeking traditional cam-driven induction dynamics.

Hydraulic roller cams eliminate the complexity and failure risk of solid roller setups while delivering precision lift and duration that solid designs provide. COMP Cams' Magnum series employs hardened steel construction with precisely ground lobes to ensure consistent valve opening and closing events across the entire RPM envelope. The roller design reduces friction losses compared to flat-tappet cams, lowering parasitic load on the crankshaft and improving overall engine efficiency. This cam works in concert with hydraulic roller lifters to automatically adjust preload, accommodating thermal expansion and maintaining optimal lash regardless of engine temperature—a critical advantage in high-output BBC applications where consistency defines performance gains.

This camshaft is ideal for big-block Chevrolet engines equipped with hydraulic roller lifters and compatible valvetrain geometry, particularly those running carbureted or modern EFI fuel systems. Installation requires proper valve clearance setup, accurate timing chain alignment, and verification that your engine block supports the 270HR lift specifications without interference. Builders working with 427, 454, or 496 BBC platforms will find the Magnum Hydraulic Roller Cam – BBC 270HR delivers the aggressive valve timing needed to unlock hidden horsepower while maintaining streetability and engine longevity. Always verify compatibility with your specific cylinder head and intake manifold configuration before installation.