WISECO K398X1 Professional Series GM LS-Series Forged Flat-Top Piston and Ring Kit

Upgrade your GM LS-Series engine with the WISECO K398X1 Professional Series piston and ring kit. Designed for performance-focused applications, this kit includes a forged flat-top piston engineered for strength, durability, and consistent operation under demanding conditions. The 4.010-inch bore application and 1.304-inch compression height support precise engine builds while the minus 3.20 cc dish volume helps maintain the intended compression characteristics.
The piston features 1.2 x 1.2 x 3.0 mm ring grooves for compatibility with the included ring package and modern performance engine requirements. Forged construction provides dependable resistance to high cylinder pressures and elevated temperatures, making this kit a suitable choice for street performance, racing, and custom GM LS-Series projects. The flat-top design also supports efficient combustion chamber compatibility when properly matched to the rest of the engine combination.
Each WISECO K398X1 kit is supplied as a piston and ring package for convenient installation during an engine rebuild or performance upgrade. Professional Series manufacturing delivers the fit, consistency, and durability expected from WISECO components. Verify bore sizing, compression height, ring groove specifications, piston-to-wall clearance, and complete engine compatibility before installation. This product is not air restricted and does not require truck freight handling.

Features:

• Brand: WISECO

• Part Number: K398X1

• Application: GM LS-Series engines

• Construction: Forged piston

• Piston Style: Flat top

• Bore Size: 4.010 inches

• Compression Height: 1.304 inches

• Ring Grooves: 1.2 x 1.2 x 3.0 mm

• Dish Volume: Minus 3.20 cc

• Kit Contents: Piston and ring set

• Series: Professional Series