Wiseco K463X185 Professional Series Chevy LS Forged Piston Set 4.185 in. Bore -2.8cc Dome

The Wiseco K463X185 is a Professional Series forged piston set engineered for Chevrolet LS platform engines running a 4.185-inch bore and 4.000-inch stroke. Forged from 2618 high-strength aluminum alloy and machined in the USA, these pistons are built for heavy- to severe-duty race applications where reliability and performance under extreme conditions are non-negotiable.

Each piston features a -2.8cc dome crown, delivering a compression ratio of approximately 12.2:1 with a 66cc combustion chamber. The set includes 8 pistons complete with precision ring packs sized at 1.2mm / 1.2mm / 3.0mm, ready for installation.

Key Features:

• 2618 forged aluminum construction — superior tensile strength for forced induction and nitrous applications
• ArmorGlide® skirt coating — reduces operating friction, minimizes skirt and cylinder wall wear, and provides quieter operation
• Anti-detonation and pressure seal grooves for enhanced ring seal integrity
• Fully machined crown features with precision ring grooves
• 0.927 in. wrist pin diameter — pin upgrade to P/N S718 (.150-inch wall pin with Spirolox) recommended for builds exceeding 700 HP
• Includes premium ring set: 1.2mm / 1.2mm / 3.0mm

Specifications:

• Bore: 4.185 in.
• Stroke: 4.000 in.
• Rod Length: 6.125 in.
• Compression Height: 1.110 in.
• Pin Diameter: 0.927 in.
• Crown Volume: -2.8cc (dome)
• Piston Weight: 500 g (approx. 1.10 lbs each)
• Compression Ratio (w/ 66cc chamber): 12.2:1
• Alloy: 2618
• Ring Sizes: 1.2mm / 1.2mm / 3.0mm

Engineered and manufactured at Wiseco's facility in Mentor, Ohio, the Professional Series represents a no-compromise solution for serious engine builders pursuing maximum performance from the GM LS platform.