Wiseco 6398RX3903 Professional Series Chevy LS Forged Piston 3.903 in. Bore Flat Top Single

The Wiseco 6398RX3903 is a Professional Series shelf-stock, right-side forged piston engineered for Chevrolet LS platform engines. Featuring a 3.903-inch bore and a -3.2cc flat-top crown with valve reliefs, this piston is purpose-built for high-performance street and race applications demanding maximum strength and reliability. Sold individually as a right-side (RX) replacement unit.

Key Features:

• 2618 forged aluminum construction — high-strength alloy delivers superior tensile strength and fatigue resistance for power-adder and boosted builds
• Strutted forging design — dedicated LS-specific forging optimizes strength-to-weight ratio
• ArmorGlide® skirt coating — reduces operating friction, minimizes wear, and allows tighter piston-to-wall clearances for quieter operation
• -3.2cc flat-top crown with valve pockets — precision-machined crown features for optimized combustion efficiency
• Precision ring grooves — top and second compression ring thickness of 0.047 in.; oil ring groove accepts 3.0mm oil ring
• Floating wrist pin design — 0.927-inch pin diameter; wrist pin included (5115 steel)
• Reluctor ring clearance — accommodates reluctor ring on stroker cranks without notching pin bosses
• Engineered and machined in the USA — manufactured at Wiseco's Mentor, Ohio facility

Specifications:

• Bore Diameter: 3.903 in.
• Compression Height: 1.304 in.
• Wrist Pin Diameter: 0.927 in.
• Piston Volume: -3.20 cc (Flat Top)
• Stroke: 3.622 in.
• Rod Length: 6.125 in.
• Top Compression Ring Thickness: 0.047 in.
• Second Compression Ring Thickness: 0.047 in.
• Oil Ring Thickness: 3.0mm
• Piston Material: 2618 Aluminum
• Wrist Pin Material: 5115 Steel
• Sold: Individually (Right Side)

Wiseco's Professional Series pistons are the no-compromise choice for serious engine builders and racers. Whether the application calls for forced induction, nitrous, or naturally aspirated high-revving builds, the 6398RX3903 delivers the durability and precision needed to support extreme power levels on the Chevrolet LS platform.