Wiseco W5110 Groove Lock Spacer 4.375-4.405in Oil Rail Support

The Wiseco W5110 Groove Lock Spacer is a precision-engineered oil rail support designed for use with Wiseco forged pistons where the wrist pin bore intersects the oil ring groove. This component is essential in high-performance engine builds with short compression heights resulting from large strokes or long rod lengths, where without proper support the oil ring could protrude through the wrist pin opening.

Key Features:

• Fits bore diameters from 4.375 to 4.405 inches
• .200 inch radial wall for precise groove fitment
• Made from spring steel for durability under demanding operating conditions
• Features a dimple orientation design to prevent rotation once installed
• Installs against the bottom sill of the oil ring groove prior to oil ring assembly
• Compatible only with pistons machined with an oil ring groove 0.030 inches wider than the oil ring

Installation is straightforward: slide the groove lock spacer into the oil ring groove with the dimple facing downward over the wrist pin hole, positioning the end gap 90 degrees from the wrist pin. This ensures correct alignment and prevents spacer rotation during engine operation.

Wiseco performance accessories are engineered and machined in the U.S. at Wiseco's Mentor, Ohio manufacturing facility, meeting the same exacting standards as their world-renowned forged piston lineup. Sold individually.