Wiseco K451XS Professional Series Chevy LS Forged Piston Set 4.000 in. Bore 3cc Dome

The Wiseco K451XS is a Professional Series forged piston set engineered specifically for Chevrolet LS platform engines running a 4.100" or 4.125" stroke with a 4.000" bore. Designed for serious racers and high-performance engine builders, this shelf-stock kit delivers custom-level durability and precision right out of the box.

Each set is forged and machined in the USA from high-strength 2618 aluminum alloy, the same material trusted in the most demanding race applications. The +3cc dome crown yields a compression ratio of approximately 12.5:1 with a 66cc chamber, making this kit ideal for aggressive naturally aspirated and power-adder builds targeting maximum cylinder pressure.

Key Features:

• Bore: 4.000 in.
• Stroke: 4.100 in. / 4.125 in.
• Rod Length: 6.125 in.
• Compression Height: 1.050 in.
• Pin Diameter: 0.927 in.
• Crown Volume: +3cc Dome
• Piston Weight: 457 grams each
• Alloy: 2618 High-Strength Aluminum
• Ring Sizes Included: 1.2mm / 1.2mm / 3.0mm GFX Steel Top / Napier 2nd ring set
• ArmorGlide® Skirt Coating for reduced friction, minimized skirt wear, and quieter operation
• Anti-detonation and pressure seal grooves for added reliability under high cylinder pressure
• Radiused valve pockets for detonation resistance and improved flow
• Strutted skirt design engineered to run at as little as 0.004" clearance
• Designed to accommodate the reluctor ring on stroker cranks — no pin boss notching required
• Pin upgrade recommended for builds exceeding 700 HP (see Pin P/N S718, 0.150" wall with Spirolox)

The K451XS is part of Wiseco's Professional Series — no-expense-spared pistons built for heavy to severe duty race applications. Whether you're building a street/strip bruiser or a dedicated track engine, these pistons deliver the strength, precision, and consistency that serious builds demand.