Wiseco K573M89AP Acura K-Series 4-Valve Domed +8cc Strutted Piston Kit 89.0mm

The Wiseco K573M89AP is a forged performance piston kit designed for the Acura/Honda K-Series 4-valve engine platform. Featuring an 89.0mm (3.504") bore and a +8cc domed crown, this kit is engineered for high-compression builds on K20 and K24 engines equipped with a K20 cylinder head.

Wiseco is the only aftermarket piston manufacturer in the United States that produces pistons exclusively through the forging process. Starting with aerospace-grade 2618 aluminum alloy, the forging process compresses the material's molecules, increasing density and aligning grain flow for superior strength, impact resistance, and fatigue resistance compared to cast alternatives.

Key Features:

• 89.0mm (3.504") bore with +8cc domed piston crown
• Strutted forging design for added strength under high-stress, high-horsepower applications
• ArmorGlide® skirt coating reduces friction and promotes long skirt life
• 2618 aerospace-grade aluminum alloy for superior strength and ductility
• 22mm wrist pin with 4130 chrome moly construction
• Compression height: 1.181" (30mm)
• Generous valve pockets designed for aggressive camshaft profiles on 4-valve heads
• Optimized skirt profiles minimize piston rock and promote bore stability for maximum ring seal
• Crown shape promotes intake charge efficiency through scavenging during valve overlap
• Compatible with power adders including turbochargers, superchargers, and nitrous oxide
• All machining performed on CNC equipment for tight tolerances
• Performance piston ring set included

The ring package features a gas nitrided top ring for excellent compatibility with forced induction, and a Napier-style second ring for superior oil control. This kit is file-fit, allowing builders to precisely set ring gap for their specific application.