Wiseco GLS22 Dimpled Oil Rail Support 3.344-3.396 in. Bore

The Wiseco GLS22 is a dimpled oil rail support (OSR) designed for use in high-performance engine builds where the piston oil ring groove intersects the wrist pin bore. This is a common situation in applications with short compression heights resulting from large strokes or long rod lengths, where the oil ring could otherwise protrude through the wrist pin opening without the support in place.

Key Features:

• Bore Range: Fits 3.344 in. to 3.396 in. (84.93mm – 86.25mm) bore diameter
• Dimpled design prevents rotation of the oil rail during engine operation
• Constructed from spring steel for durability and consistent tension
• Installed against the bottom sill of the oil ring groove
• Dimple must be oriented downward and aligned over the wrist pin hole, positioning the end gap 90 degrees from the wrist pin
• Compatible only with pistons that have the oil ring groove machined 0.030 in. wider than the oil ring itself
• Sold individually — one (1) oil rail support per package

Proper installation is critical: the rail support gap must be kept 90 degrees from the pin bore, and care must be taken not to install the rail tab into the piston pin oil hole. In horizontally opposed engine configurations, rail gaps should be positioned per Wiseco's installation guidelines. The Wiseco GLS22 oil ring spacer is an essential component for any performance engine rebuild requiring an OSR-compatible piston.