Wiseco K446X125 Professional Series Forged Piston Set Chevy LS 4.125 in. Bore -18cc Dish

The Wiseco K446X125 is a Professional Series forged piston set engineered for Chevrolet LS platform engines. Designed for serious racers and performance builders, this set features a 4.125-inch bore, 1.110-inch compression height, and a -18cc dish combustion chamber volume, providing a solid foundation for high-compression or power-adder builds.

Forged, engineered, and machined in the USA from 2618 high-strength aluminum alloy, these pistons deliver the tensile strength required for heavy to severe duty race applications including turbocharged, supercharged, and nitrous-fed combinations.

Key Features:

• 2618 High-Strength Aluminum Alloy — exceptional tensile strength for demanding race and power-adder environments
• ArmorGlide® Skirt Coating — reduces operating friction, minimizes cylinder wall wear, and enables quieter operation
• -18cc Dish Crown — optimized combustion chamber design for LS platform compression tuning
• 1.110 in. Compression Height — designed for proper deck clearance on standard LS short blocks
• 0.150-inch wall wrist pin with Spirolox retainers — included; pin upgrade to P/N S718 recommended for builds exceeding 700 HP
• Anti-detonation and pressure seal grooves — critical for high-boost and high-RPM durability
• Premium GFX Ring Set Included — 1.2mm / 1.2mm / 3.0mm ring pack for optimized sealing and reduced friction

The Wiseco Professional Series represents a no-compromise approach to piston design. Each piston is precision-machined at Wiseco's Mentor, Ohio manufacturing facility and is backed by decades of racing heritage. Whether building a naturally aspirated stroker or a forced-induction race engine, the K446X125 delivers the performance and reliability demanded at the top levels of motorsport.