Rocker Arm Trunnion Kit LS7 w/1.8 Ratio Rockers

The Rocker Arm Trunnion Kit LS7 w/1.8 Ratio Rockers is a precision-engineered valvetrain upgrade designed for serious LS engine builders and performance enthusiasts pushing their Gen IV powerplants to the limit. Built by Straub Technologies, this kit addresses a critical need: maintaining reliable, consistent valve actuation under extreme rpm and boost conditions where factory rocker geometry begins to fail. Whether you're building a dedicated track engine, stroker combo, or forced-induction platform, the 1.8 ratio rockers provide the mechanical advantage required to maximize valve lift while keeping pushrod angles in the optimal operating window.

This kit features a complete trunnion assembly that replaces the stock pivot point, delivering tighter tolerances and reduced deflection during aggressive valve events. The 1.8:1 rocker ratio increases effective valve lift by roughly 80 percent compared to stock 1.5:1 geometry, enabling better cylinder head flow, faster valve transitions, and improved combustion efficiency—critical when running larger cams or modified cylinder heads. Straub's design maintains proper rocker arm geometry across the full valve lift spectrum, preventing binding and minimizing side loading on pushrods. The compact footprint (14.3 inches long) fits within existing LS valley components, and the 3.9-pound assembly adds minimal weight while delivering maximum valvetrain stability and component longevity.

Buyers upgrading LS7 engines—whether naturally aspirated road course builds, turbocharged street/strip hybrids, or competition drag applications—will see immediate returns in top-end power and valve actuation reliability. Installation pairs seamlessly with performance pushrods, adjustable rocker arms, and upgraded valve springs commonly found in modified LS packages. For those consolidating valvetrain components, this kit integrates with both traditional LS7 heads and aftermarket cylinder head platforms that accept the standard trunnion diameter. Proper pushrod length selection and initial rocker geometry verification are essential; consultation with your head supplier or engine builder is recommended to confirm compatibility with your specific cam profile and cylinder head combination.