Wiseco K396X3903 Piston Kit Chevy LS Series 3.903" Bore Shelf Stock

The Wiseco K396X3903 is a shelf-stock forged piston kit designed for Chevy LS Series engines. Wiseco's shelf-stock piston kits offer enthusiasts and engine builders a cost-effective solution without sacrificing the strength and precision of a fully forged piston. These pistons are manufactured to tight tolerances and are ready to ship without custom lead times, making them an ideal choice for street performance, mild builds, and engine rebuilds.

Wiseco forged pistons are produced using a cold-forging process that creates a denser, stronger grain structure compared to cast alternatives. This results in superior strength, improved heat dissipation, and extended engine life — qualities that are essential in high-compression or high-performance LS applications.

Key Features:

• Bore Size: 3.903 inches
• -3° Valve Reliefs: Designed to clear performance camshaft and cylinder head combinations common in LS builds
• Forged aluminum construction for superior strength and thermal management
• Shelf-stock availability — no custom lead time required
• Manufactured to OEM-grade tolerances for proper ring seal and longevity
• Compatible with Chevy LS Series engine platforms
• Includes full piston set as configured for the application

Whether you're rebuilding a stock displacement LS or refreshing a bored-over block, the Wiseco K396X3903 piston kit delivers proven forged-piston performance right off the shelf. Trust Wiseco's decades of motorsport engineering expertise in your next LS engine build.