Wiseco K398X3 Forged Pistons 4.030" -3.2 cc for Chevy LS V8

Vehicle Fitment

• Chevrolet LS-series V8 engines (Gen III / Gen IV)

Features

• Forged from high-strength 2618 aluminum for superior durability
• ArmorGlide® skirt coating to reduce friction and resist wear
• Flat-top piston crown with -3.2 cc volume for balanced compression
• Anti-detonation and pressure-seal grooves to improve ring sealing
• Floating 0.927" wrist pin for stable high-RPM operation
• Strutted piston design to maintain rigidity under load
• Includes premium ring set (1.2 mm / 1.2 mm / 3.0 mm)
• Compatible with naturally aspirated, nitrous, or moderately boosted applications

Specifications

• Bore Diameter: 4.030 in
• Stroke: 3.622 in
• Compression Height: 1.304 in
• Piston Volume: -3.2 cc (flat-top)
• Piston Material: 2618 forged aluminum
• Wrist Pin Diameter: 0.927 in
• Rod Length Compatibility: 6.125 in
• Average Weight (per piston): ~478 g 

Included Components

• 8 x Forged pistons (K398X3)
• 8 x Floating wrist pins (0.927")
• 16 x Retaining clips / Spirolox
• 8 x Ring sets (1.2 / 1.2 / 3.0 mm)

Product Description

The Wiseco K398X3 is a professional-series piston set crafted for Chevrolet LS V8 applications. It features a 4.030" bore and a -3.2 cc flat-top design, making it suitable for performance builds where a moderate compression ratio is desired. This configuration supports NA, nitrous, or mildly boosted engines.

Constructed from durable 2618 aluminum, these pistons deliver excellent strength and resistance to fatigue. The ArmorGlide® coating helps reduce friction, and the strutted forging ensures reliable support across the piston skirt. Anti-detonation and pressure-seal grooves improve ring sealing and engine efficiency under load.

Supplied with 0.927" floating wrist pins, retainer clips, and high-quality ring sets, this 8-piston kit is ready for a full top-end rebuild. For optimal performance and longevity, verify ring end gap, piston-to-wall clearance, and piston-to-head clearance during installation using Wiseco's recommended specifications.