Wiseco 6398LXS Professional Series Chevy LS Forged Piston -3.2cc Flat Top 4.000 in. Bore

The Wiseco 6398LXS is a Professional Series shelf-stock forged piston engineered for Chevrolet LS-based engines. Featuring a -3.2cc flat-top crown with valve reliefs, a 4.000 in. bore diameter, a 1.3045 in. compression height, and a 0.927 in. pin diameter, this individual piston is sized for stock-bore LS applications and high-performance builds alike.

Part of Wiseco's no-compromise Professional Series, these pistons are forged and machined in the USA from 2618 aluminum alloy for superior tensile strength under the extreme thermal and mechanical loads found in boosted, nitrous, and heavy-duty race environments. The dedicated LS-specific forging incorporates optimized valve pocket geometry, a precision-machined ring groove package, and engineered skirt profiles for reduced friction and improved piston stability.

Key Features:

• -3.2cc flat-top crown with valve reliefs for optimized compression ratio tuning
• 4.000 in. bore ? shelf stock sizing for standard LS bore applications
• 1.3045 in. compression height compatible with standard 6.125 in. LS connecting rods
• 0.927 in. pin diameter for use with standard LS wrist pins
• Forged from 2618 aluminum for high tensile strength in power-adder applications
• ArmorGlide? skirt coating for seizure resistance, friction reduction, and quieter operation
• Dedicated LS-specific forging with optimized skirt profile and precision ring grooves
• Designed for high-boost, nitrous, and heavy-duty race builds
• Sold individually as a shelf-stock single piston ? ideal for replacement or custom builds
• Engineered, forged, and machined in the USA

The Wiseco 6398LXS is an ideal choice for engine builders needing a proven, race-proven forged piston for LS platform builds. As a shelf-stock item, it ships quickly without the lead time of custom orders. Compatible with the full range of LS-architecture V8 engines using a 4.000 in. bore.