Wiseco K394X3905 Forged Piston Kit Chevy LS -8cc Dish 3.905 in. Bore

The Wiseco K394X3905 is a Professional Series forged piston kit engineered for Chevrolet LS Series engines running a 4.000-inch stroke. This shelf-stock kit features a 3.905-inch bore, -8cc reverse dome (dish) design, and a 1.115-inch compression height, delivering a compression ratio of approximately 10.5:1 with a 65cc combustion chamber. Each kit includes eight forged pistons, ring sets, wrist pins, and Spirolox retainers — everything needed for a complete bottom-end build.

Key Features:

• 2618 High-Strength Aluminum Alloy — forged, engineered, and machined in the USA for superior tensile strength and durability under extreme heat and pressure
• ArmorGlide® Skirt Coating — reduces friction, resists seizure, and promotes quieter operation
• -8cc Reverse Dome (Dish) — 3.905 in. bore, 1.115 in. compression height, ~10.5:1 compression ratio at 65cc combustion chamber
• Anti-Detonation & Pressure Seal Grooves — added protection under high-boost, nitrous, and high-RPM conditions
• .927 in. Wrist Pin (S643) — included with .150 wall thickness; pin upgrade (P/N S718) recommended for builds over 700 HP
• LS1/LS2/LS3/LS6/LS9 Valve Pockets — machined to accommodate common LS cylinder head valve configurations
• Ringset Included — Part No. 3905GFX (x8), one complete set per piston
• Compatible with NA, Boost, and Nitrous applications — rated for demanding race builds
• Spirolox® Pin Retainers Included — secure wrist pin retention for high-performance use

Specifications:

• Bore: 3.905 in.
• Compression Height: 1.115 in.
• Stroke: 4.000 in.
• Rod Length: 6.125 in.
• Deck Height (0 Deck at): 9.240 in.
• Piston Weight: 397 grams (avg.)
• Dish Volume: -8cc
• Compression Ratio at 65cc: 10.5:1 | at 66cc: 10.2:1 | at 68cc: 10.1:1 | at 70cc: 9.9:1
• Wrist Pin P/N: S643 (.927 x 2.250)
• Ring Set P/N: 3905GFX

Wiseco's Professional Series piston kits are the choice of serious engine builders who demand race-proven reliability in high-performance LS builds. Backed by decades of forging expertise and manufactured in Mentor, Ohio, these pistons are built to withstand the rigors of forced induction, nitrous, and naturally aspirated high-horsepower applications.