Shaft Rocker Arm Kit SBC 1.6/1.5 Ratio

The Shaft Rocker Arm Kit SBC 1.6/1.5 Ratio is a precision-engineered valvetrain upgrade designed for small-block Chevrolet engine builders and performance enthusiasts seeking reliable, high-RPM capability. This shaft-mounted rocker arm system replaces traditional stud-mounted designs, delivering superior stability and repeatability across aggressive cam profiles and extended engine speeds. Whether you're building a street performance engine, circle-track racer, or naturally aspirated hot rod, this kit provides the mechanical foundation needed to unlock consistent valve actuation and maximize horsepower potential.

Shaft rocker arm systems eliminate deflection common in stud-mount designs by distributing loads directly through a solid shaft, ensuring precise valve opening and closing geometry even under high valve spring pressures. The 1.6/1.5 ratio configuration offers a balanced approach—the 1.6 ratio arms increase valve lift by 60% relative to camshaft lobe rise, while the 1.5 ratio side provides versatility for dual-pattern applications or mild-to-moderate lift requirements. This dual-ratio design accommodates both intake and exhaust sides independently, allowing builders to optimize valve events for specific cylinder head flow characteristics and combustion chamber demands without sacrificing reliability or durability.

Installation requires proper alignment with SBC head porting and compatible pushrods, making this kit ideal for builders upgrading beyond factory or entry-level performance rocker systems. The 17.85 lbs weight includes all components necessary for complete valvetrain renewal, and dimensions (10.8 x 4.2 x 20.4 inches) reflect a full dual-ratio assembly ready for engine dress-up. This upgrade pairs seamlessly with modern aftermarket camshafts, aluminum cylinder heads, and high-rpm valve springs—essential for anyone serious about extracting consistent power from a small-block platform for street, strip, or competition use.