SBC Rocker Arm

The Chevrolet Performance SBC Rocker Arm (part number 12681275) is a full roller, pedestal-mount rocker arm engineered for small-block Chevy and GM LS-series engine builds. This component delivers the precision valve actuation required for high-performance street, strip, and track applications where reliability and consistent lift ratios are non-negotiable. The 1.70 ratio configuration balances valve lift and duration characteristics to optimize mid-range responsiveness while maintaining safe valve-to-piston clearance across the RPM band.

Built from steel in a natural finish, this pedestal-mount rocker arm features full roller construction—a critical specification that reduces friction at the cam lobe contact point. Full roller designs minimize wear under high-lift, high-duration cam profiles and maintain more consistent valve timing than stamped arms, especially during extended WOT (wide-open throttle) runs. The 1.70 ratio means the rocker multiplies valve lift by a factor of 1.70, directly affecting peak valve velocities and port flow characteristics. Whether you're building a carbureted small-block or retrofitting LS cylinder heads onto a classic platform, precise rocker arm selection ensures proper valve clearances, predictable valve events, and long component life.

This rocker arm suits builders and engine builders assembling high-performance small-block or LS-series powerplants. Serious enthusiasts restoring muscle cars, building street rods, or tuning track cars rely on OEM Chevrolet Performance rocker arms to ensure factory-correct geometry and durability. The SBC Rocker Arm integrates seamlessly with matching pushrods, valve springs, and cam profiles to create a harmonized valve train free from binding, instability, or premature wear.

Rocker arm selection is foundational to engine reliability. Mismatched or worn rockers introduce inconsistent valve timing, accelerated pushrod and valve stem wear, and potential valve-to-piston contact at high RPM. TacticalSurplusUSA stocks genuine Chevrolet Performance rocker arms in popular ratios and configurations so builders can source exact OEM replacements or upgrade components with confidence. Each arm is sold individually; order the quantity matching your cylinder count (eight for small-block, sixteen for big-block dual-quad setups).