S/S Shaft Mount R/A System - BBM 1.5 Ratio

The S/S Shaft Mount R/A System - BBM 1.5 Ratio is a precision rocker arm assembly engineered for high-performance Mopar B and RB-series engine platforms. This shaft-mounted roller tip design delivers improved valve actuation geometry and reduced friction compared to conventional stud-mounted systems. Built for builders and enthusiasts who demand reliable valve train performance in competition, street, and rebuild applications, this system represents a critical upgrade for optimizing engine breathing and longevity.

The 1.50 rocker ratio amplifies cam lift by 50 percent, allowing smaller cam profiles to generate larger valve openings—a key advantage for improving flow without excessive duration. The roller tip design minimizes wear on the pushrod and valve stem, reducing parasitic friction losses and extending component service life. Manufactured from durable steel and finished in natural (unplated) form, the shaft-mount configuration provides superior stability and alignment compared to individual stud mounts, critical for maintaining precise valve timing at high RPM. The complete kit delivers all necessary components for straightforward installation on compatible Mopar engines.

This assembly is ideal for engine builders, restoration shops, and performance enthusiasts rebuilding or upgrading Mopar B-block and RB-block engines. The shaft-mount design ensures consistent rocker geometry across the valve train, eliminating the alignment drift that can occur with individual stud mounts during extended high-RPM operation. Installation requires removal of the cylinder head and careful synchronization with existing pushrod and valve stem lengths. Verify compatibility with your specific engine variant and intake manifold clearance before ordering, as rocker ratio systems demand precise OEM or performance-matched components for reliable function.