Wiseco 6650M875 Honda K-Series Dome Forged Piston Bore - 10.5cc 87.5mm

The Wiseco 6650M875 is a Professional Series forged racing piston engineered for Honda K-Series engines. Featuring an 87.5mm (3.445 in) bore, a +10.5cc dome crown, and a 1.181 in (30mm) compression height, this piston is purpose-built to raise compression ratios in high-performance K-Series builds. Sold individually as shelf stock, it pairs with a 22mm (0.866 in) wristpin.

Key Features:

• Forged 2618 aluminum construction — engineered, forged, and machined in the USA for superior tensile strength and fatigue resistance
• +10.5cc dome crown — raises compression for naturally aspirated or boosted high-performance applications
• 87.50mm bore / 1.181 in (30mm) compression height — direct fitment for K-Series stroked and built applications
• 22mm (0.866 in) offset wristpin — reduces piston slap and improves ring seal under high load
• ArmorGlide® skirt coating — provides seizure resistance, friction reduction, and quieter piston operation
• Nitride/Napier steel ring package — precision ring grooves with anti-detonation groove and enhanced ring seal features
• Forced pin oiling — ensures consistent lubrication of the wristpin under sustained high-RPM use
• Designed and built for heavy to severe duty race builds

The Wiseco 6650M875 is the single-piston shelf stock version of the Professional Series Honda K-Series lineup. It is ideal for engine builders sourcing individual pistons for custom stroked assemblies or replacement in an existing build. As with all Wiseco Professional Series pistons, this unit is not legal for sale or use on pollution-controlled motor vehicles in California.