Wiseco K0037X25 Chrysler 6.1L Hemi Forged Piston Set -13cc Dish 4.080 Bore 1.080 CH

The Wiseco K0037X25 is a professional-grade forged piston set engineered for the Chrysler 6.1L Hemi platform. Featuring a 4.080-inch bore, -13cc dish crown, and a 1.080-inch compression height, this set is purpose-built to match stock deck geometry while supporting a 4.080-inch stroker crankshaft — the combination that yields approximately 426 cubic inches, commonly known among enthusiasts as the modern 426 Hemi.

Each piston is forged from high-strength 2618 aluminum alloy and machined at Wiseco's facility in Mentor, Ohio. The lightweight design weighs in at approximately 440 grams per piston, contributing to reduced reciprocating mass and improved throttle response. The .866-inch diameter wrist pin bore is sized to accept Wiseco's matching lightweight pin set. Note: These pistons require compatible K1 or equivalent connecting rods designed for the .866-inch wrist pin diameter.

Key Specifications:

• Bore: 4.080 in. (+0.025 in. over stock)
• Compression Height (CH): 1.080 in.
• Crown: -13.0cc Dish
• Stroke: 4.080 in.
• Rod Length: 6.125 in.
• Wrist Pin Diameter: 0.866 in.
• Piston Weight: 440 grams (advertised)
• Application: Chrysler / Dodge 6.1L Hemi (3rd Generation)

The ArmorGlide skirt coating reduces friction, resists seizure, and contributes to quieter operation — making this set suitable for both dedicated race builds and high-performance street engines. Precision ring grooves and a fully machined crown ensure consistent sealing and long-term durability under boost, nitrous, or naturally aspirated high-RPM use.