Wiseco K421B110 Professional Series BBC Big Chief 3815 Head Forged Piston Set +15.6cc 4.610in Bore

The Wiseco K421B110 is a Professional Series shelf-stock forged piston set engineered specifically for the Chevrolet Big Block (BBC) with Big Chief 3815 cylinder heads.

Key Features:

• 2618 High-Strength Aluminum Alloy — forged, engineered, and machined in the USA at Wiseco's Mentor, Ohio facility for superior tensile strength in heavy to severe duty applications
• +15.6cc Solid Dome — matched to the Big Chief 3815 head combustion chamber for optimized compression ratio
• 4.610 in. Bore Diameter — shelf-stock sizing for immediate availability without custom lead times
• 1.120 in. Compression Height — designed to work with appropriate stroke and rod combinations in big-inch BBC builds
• 0.990 in. Pin Diameter — includes premium tool-steel wrist pin and double Spirolox® retaining rings
• ArmorGlide® Skirt Coating — reduces operating friction, resists seizure, minimizes cylinder wall wear, and quiets operation
• Vertical Gas Ports — improves ring seal and combustion efficiency
• Precision Anti-Detonation Groove — added ring land protection for forced induction and nitrous-compatible builds
• Forced Pin Oiling — ensures consistent lubrication to the wrist pin under high-load conditions
• Rings sold separately — compatible with standard BBC Professional Series ring sets

As part of Wiseco's Professional Series lineup, the K421B110 piston kit is a no-compromise solution packed with custom-level performance features right out of the box. Wiseco Professional Series pistons are designed and built for heavy to severe duty race applications, making this set the go-to choice for Big Chief–headed BBC race engines.