Wiseco K0448X6 Gen V LT1 Forged Piston Kit 4.125 in. Bore -6.9cc Flat Top

The Wiseco K0448X6 is a Professional Series forged piston kit engineered specifically for the GM Gen V LT1 engine platform. Featuring a 4.125-inch bore, 4.000-inch stroke, -6.9cc flat top crown, and a 1.115-inch compression height, this kit is purpose-built for builders seeking maximum performance from the direct-injected Gen V architecture.

Engineered, forged, and machined entirely in the USA from 2618 high-strength aluminum alloy, these pistons deliver the tensile strength and heat tolerance demanded by high-output and forced induction applications. The advanced crown geometry is specifically designed for direct injection compatibility, featuring precise valve pockets and a radically optimized dome profile developed around the LT1's unique combustion chamber and DI spray pattern.

Key Features:

• 4.125 in. Bore / 4.000 in. Stroke / -6.9cc Flat Top Crown
• 1.115 in. Compression Height
• ArmorGlide® Skirt Coating — seizure resistant, friction reducing, and engineered for quieter operation; allows tighter bore fitment for improved ring seal and reduced piston rock
• Forged from 2618 high-strength aluminum alloy for improved tensile strength and heat resistance
• Advanced crown design optimized for GM Gen V direct injection fuel delivery
• Precision-machined ring grooves with anti-detonation groove and pressure seal features
• Designed for use with stock connecting rod
• Includes .180-inch wall pins and wire locks
• Forged and machined entirely in the USA

The K0448X6 is part of Wiseco's comprehensive Gen V LT piston lineup, available in multiple bore sizes and compression ratios to support naturally aspirated builds, supercharged applications, and stroker combinations.