Wiseco K0120A125 Big Block Mopar Flat Top Piston Set 4.375 Bore 383/400/440

The Wiseco K0120A125 is a professional-grade forged piston set designed for Chrysler Big Block Mopar 383, 400, and 440 engines featuring a 4.375-inch bore, 3.750-inch stroke, and flat top configuration with -6cc volume. Professional Series forged racing pistons from Wiseco are no-expense-spared pistons designed for serious racers and builders, packed full of custom-level performance and durability features for heavy to severe duty race builds.

Key Specifications:

• Bore: 4.375 inches
• Compression Height: 1.250 inches
• Stroke: 3.750 inches
• Rod Length: 6.800 inches
• Piston Volume: -6cc
• Average Weight: 534 grams per piston
• Wrist Pin: S462 .990 x 2.930 inches (included)

Premium Features:

• 2618 aerospace alloy for superior strength-to-weight ratio
• ArmorGlide skirt coating for seizure resistance, friction reduction, and quieter operation
• Anti-detonation and pressure seal grooves
• Ring configuration: 1/16", 1/16", 3/16" (rings sold separately)
• 0.250-inch top ring land
• Slab-sided skirt design
• Engineered, forged, and machined in the USA

Compression Ratios:

• 11.5:1 at 72cc
• 10.8:1 at 78cc
• 10.2:1 at 84cc
• 9.7:1 at 90cc

This complete piston set includes wrist pins and is designed for use with Wiseco ring set J100F8-4375-5 (sold separately). Designed and built to withstand heavy to severe duty performance applications, these pistons are ideal for engine rebuilds, racing applications, and high-performance street engines.