CT525 Crankshaft Adapter

The CT525 Crankshaft Adapter from Winters is a precision mechanical coupling solution designed for builders and technicians who need to mate a Winters crankshaft assembly to GM LS-series engine platforms. This adapter solves a critical compatibility gap in high-performance and custom engine builds where OEM crankshaft geometry differs from modern LS platform standards. Whether you're assembling a vintage-to-modern engine swap, building a race engine, or executing a custom marine or powersports application, this crankshaft coupler ensures reliable torque transfer between dissimilar crankshaft designs.

Constructed from hardened steel with cadmium plating, the CT525 delivers corrosion resistance and exceptional durability under sustained mechanical stress. The cadmium finish protects against oxidation in diverse environments—from engine bay heat cycles to moisture exposure—while maintaining dimensional stability critical to crankshaft alignment. At 1.54 lbs and compact dimensions (4.85 x 0.95 x 8.65 inches), the adapter integrates cleanly into tight engine compartments without adding unnecessary weight. The precision-engineered coupling geometry ensures minimal runout and vibration, essential for maintaining proper harmonic balancer function and preventing secondary damage to accessory drives or internal engine components.

Engine builders, machine shops, and serious automotive enthusiasts benefit most from this adapter when undertaking complex drivetrain conversions or performance builds where factory-matched components are unavailable. Installation requires precise alignment and fitment verification—improper installation can introduce vibration that damages downstream components. This coupler is a one-piece, bolt-on solution; verify that your specific Winters crankshaft and LS block configuration match the adapter's bore and mounting geometry before purchase. Compatible exclusively with Winters crankshaft designs paired to LS-series platforms, the CT525 eliminates the need for custom machine work or fabrication.