LS7 Rocker Arm Exhaust 1.8 Ratio

The LS7 Rocker Arm Exhaust 1.8 Ratio from Chevrolet Performance is a precision-engineered rocker arm assembly designed for high-performance LS-series engine builders and enthusiasts. This full roller exhaust rocker arm is engineered to maximize valve lift and duration on the exhaust side of your engine package, making it essential for those seeking improved scavenging and sustained power delivery across the RPM band. Whether you're building a street-strip LS7, supercharged small-block variant, or competition engine, this rocker arm delivers the mechanical advantage necessary to optimize camshaft profile utilization.

The 1.8 ratio design multiplies your camshaft lift by precisely 1.8 times at the valve, translating modest cam motion into substantial valve opening—critical for exhaust flow optimization without requiring an extreme, impractical cam grind. Constructed from hardened steel with a full roller design, this pedestal-mount rocker arm reduces friction between the rocker tip and valve stem, minimizing parasitic losses and extending component life under sustained high-RPM operation. The natural steel finish provides durability and is compatible with both mild and aggressive valve spring rates, though proper spring pressure tuning is essential to prevent valve float and ensure consistent valvetrain stability.

This rocker arm is sold individually and pairs with a matching intake-side unit (typically 1.6 ratio) as part of a complete LS valvetrain upgrade. Engine builders and tuners select the LS7 Rocker Arm Exhaust 1.8 Ratio when transitioning from stock 1.5 ratio assemblies or when targeting elevated fuel mapping, aggressive turbo/supercharger applications, or naturally aspirated builds requiring maximum breathing efficiency. Proper installation requires careful attention to rocker arm geometry, pushrod length verification, and valve lash adjustment—consultation with LS platform technical resources or an experienced builder is recommended to ensure correct clearances and optimal performance.