Wiseco K643M96AP Forged Piston Kit Nissan VQ37 96mm 9:1 ArmorPlating

The Wiseco K643M96AP is a Professional Series forged piston kit designed for the Nissan VQ37VHR 3.7L 24-valve V6 engine. Built to a 96.00mm bore with a 1.198" (30.43mm) compression height and a -15.5cc reverse dome, this kit delivers a 9.0:1 compression ratio suited for high-performance naturally aspirated and forced induction builds.

The "AP" designation indicates Wiseco's proprietary ArmorPlating coating, an electroless nickel-based treatment applied to the piston dome, ring grooves, and wrist pin bores. This coating gains hardness when exposed to heat, providing exceptional detonation resistance, reduced piston ring blow-by, and lower friction at the pin bore — critical advantages in high-output engine applications.

Key Specifications:

• Bore: 96.00mm (3.780")
• Stroke: 86mm (3.385")
• Rod Length: 149.5mm (5.886")
• Compression Height: 30.43mm (1.198")
• Dome Volume: -15.5cc (reverse dome / dish)
• Compression Ratio: 9.0:1
• Wrist Pin Diameter: 22mm
• Engine: Nissan VQ37VHR 3.7L V6

Key Features:

• ArmorPlating Coating: Applied to dome, ring grooves, and wrist pin bores — increases ring groove durability, prevents micro-welding of piston rings, reduces carbon buildup, and resists detonation damage
• ArmorGlide Skirt Coating: Anti-friction polymer coating on the skirts minimizes scuffing during break-in and reduces cylinder wall friction
• 2618 Forged Aluminum Construction: Engineered, forged, and machined in the USA for superior tensile strength under heavy and severe-duty race conditions
• Dedicated Forgings: Produced in-house by Wiseco for optimized weight, strength, and piston geometry
• Specially Designed Valve Pockets: Multi-valve-optimized crown geometry with complex dome shapes
• Steel Nitride/Napier XX Ring Pack: Included rings, pins, and locks — gas-nitrided top ring for heat resistance, Napier second ring for superior oil control

The Wiseco K643M96AP piston kit is engineered for serious performance builders demanding race-proven forged piston technology with premium protective coatings for the Nissan VQ37VHR platform.