BBC Solid Roller Cam 47S 321R12

The COMP Cams BBC Solid Roller Cam 47S 321R12 is a purpose-built camshaft engineered for serious big-block Chevy performance applications where maximum lift and aggressive valve timing are essential. This solid roller design eliminates the compliance issues inherent in hydraulic roller cams, delivering consistent, repeatable valve events cycle after cycle—ideal for high-RPM racing and dedicated competition engines.

The solid roller design eliminates hydraulic lash adjusters, reducing parasitic losses and allowing tighter valve clearance control for maximum efficiency and durability under extreme loads. The 47S designation indicates aggressive intake and exhaust profiles with lift and duration figures optimized for high-flow cylinder heads and low-restriction intake manifolds, while the 321R12 suffix reflects COMP Cams' precision grind specifications. The hardened steel construction and roller follower engagement surfaces withstand the rigorous demands of sustained high-RPM operation.

This camshaft is designed for big-block Chevy engines (BBC) in the 396, 402, 427, and 454 displacement ranges, making it an excellent choice for builders and tuners looking to unlock power across the mid and upper RPM band while maintaining reliability in both street and track environments.