Wiseco K0421X3 LS Stroker Forged Piston Kit 4.030 Bore 3.900 Stroke -9cc Dish

The Wiseco K0421X3 is a Professional Series forged stroker piston kit designed specifically for GM/Chevrolet LS-based engines built around a 3.900-inch stroke. Featuring a 4.030-inch bore, -9cc dish crown, 0.927-inch wrist pin, and a matched 6.125-inch rod length, this kit is purpose-built for serious stroker combinations demanding strength and precision.

Key Specifications:

• Bore Diameter: 4.030 in.
• Stroke: 3.900 in.
• Rod Length: 6.125 in.
• Crown Volume: -9cc Dish
• Wrist Pin Diameter: 0.927 in.

Key Features:

• 2618 Forged Aluminum Construction — Engineered, forged, and machined in the USA for improved tensile strength and reliability under extreme loads
• ArmorGlide® Skirt Coating — Seizure-resistant coating that reduces operating friction, minimizes skirt and cylinder wear, and allows tighter bore fitment
• Fully Machined Crown — Precision ring grooves and combustion chamber geometry optimized for the LS stroker platform
• Anti-Detonation Groove — Improves ring seal performance under high-boost and power-adder applications
• Forced Pin Oiling — Ensures consistent wrist pin lubrication under severe-duty race conditions
• Premium Ring Set Included — Complete kit includes wrist pins and a matched performance ring set

The Wiseco K0421X3 is built for heavy-duty and severe-duty race applications where off-the-shelf pistons simply won't hold up. Whether you're assembling a naturally aspirated stroker or a boosted LS combination, these forged pistons deliver the strength-to-weight ratio and durability required to perform at the highest level.