Wiseco PTS523AS Pro Tru Street Forged Piston Kit for Chevy LS 4.000" Bore

Vehicle Fitment

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

Features

• Forged 4032-alloy aluminum for durability and thermal stability
• ArmorGlide® skirt coating for reduced friction and wear
• As-forged dome (≈ +4.00 cc) with oil drain-backs for efficient oil control
• Floating chromium-alloy wrist pins with Spirolox retainers
• Symmetrical valve reliefs for high-lift cam compatibility
• Ring groove spec: 1/16" top, 1/16" second, 3.00 mm oil ring
• Complete kit: pistons, rings, pins, and retainers included
• Designed for street-driven high-performance LS applications

Specifications

• Part Number: PTS523AS
• Bore Diameter: 4.000"
• Compression Height: 1.335"
• Dome Volume: +4.00 cc
• Wrist Pin Diameter: 0.945"
• Material: Forged 4032 aluminum
• Piston Count: 8
• Ring Sizes: 1/16", 1/16", 3.00 mm
• Estimated Compression Ratio: ~11.0 : 1 (with typical 65 cc LS chamber) :contentReference[oaicite:0]{index=0}

Included Components

• 8x Forged pistons
• 8x Chromium-alloy floating wrist pins
• 8x Spirolox retainers / clips
• 8x Full ring sets (top, second, oil ring)

Product Description

The **Wiseco PTS523AS** is a Pro Tru Street forged piston kit crafted for Chevrolet LS-series V8 engines. These pistons are made from 4032 aluminum, delivering a combination of strength and thermal performance ideal for high-output street engines. The ArmorGlide® coating on the skirts helps reduce friction and protect the pistons under load.

Featuring a +4 cc as-forged dome, these pistons raise compression and are well-suited for naturally aspirated or mildly tuned LS builds. The design includes oil drain-backs and symmetrical valve reliefs to support efficient combustion and clean operation. Floating 0.945" wrist pins secured with Spirolox retainers ensure reliable pin retention even under stress.

Every set includes eight pistons, rings, pins, and retainers, making it a complete solution for LS engine top-end rebuilds. Whether you're building a performance street motor or refreshing a factory LS block, the PTS523AS provides a durable, ready-to-install kit with premium materials and engineering.