S/S Shaft Mount R/A System - BBM 1.6 Ratio

The S/S Shaft Mount R/A System - BBM 1.6 Ratio is a high-performance rocker arm assembly engineered for Mopar B and RB-series engines seeking reliable valve actuation and enhanced durability. This shaft-mount rocker arm system is designed for enthusiasts and professional engine builders who demand precision in their top-end modifications, whether for street performance, racing applications, or comprehensive engine rebuilds. The 1.60 ratio provides optimized valve lift multiplication, making it an ideal choice for camshaft combinations requiring superior mechanical advantage and consistent valve train geometry.

Constructed from durable steel with a natural finish, this rocker arm features a roller tip design that significantly reduces friction between the arm and valve stem, translating to improved efficiency and reduced wear over extended use. The shaft-mount configuration provides superior stability compared to stud-mounted systems, ensuring consistent geometry across the entire RPM range and maintaining precise valve timing regardless of engine load or vibration. The 1.6 ratio geometry amplifies camshaft lift by 60 percent, making it particularly effective for higher-lift cam profiles while maintaining proper valve clearance and preventing unwanted coil bind. At 15.84 lbs for the complete kit, the system delivers robust construction without excessive weight penalty.

This rocker arm assembly is essential for anyone serious about optimizing Mopar B/RB-series engine performance, from 340 and 360 cubic-inch builds to larger displacement applications. Installation requires proper pushrod length calculation and verification of valve clearance—critical steps that ensure reliability and prevent catastrophic valve train failure. The roller tip design minimizes horsepower loss in the valve train itself, allowing more of your engine's power to reach the wheels. Verify compatibility with your specific engine displacement and camshaft specifications before installation, and consider this upgrade a foundational component for any top-end rebuild pursuing maximum efficiency and longevity.