Molnar Technologies 426-3750MC6F Big Block Mopar Forged Crankshaft 3.750 Stroke 8-Bolt

The Molnar Technologies 426-3750MC6F is a premium forged crankshaft designed for Big Block Chrysler (BBM) 413, 426 Wedge, 426 Hemi, and 440 RB-series V8 engines. Featuring an 8-bolt flange and a 3.750-inch stroke, this crank is engineered to deliver the durability and precision required for high-performance street builds and all-out competition applications.

Key Features:

• Material: Forged 4340 steel — heat treated to maximize tensile strength
• Surface Treatment: Shot peened for increased fatigue life; nitrided for superior wear resistance and improved bearing life
• Inspection: 100% magnetic particle inspected to ensure freedom from cracks or defects
• Stroke: 3.750 inches
• Main Journal: 426/440 (2.750-inch) Big Block Chrysler mains
• Rod Pin Diameter: 2.200 inches (BB Chevy rod journal)
• Minimum Rod Length: 6.760 inches
• Bob Weight: 2350 grams
• Flange: 8-bolt configuration
• Oiling: Straight oil holes for optimized lubrication to rod journals
• Fillet Radii: .125 inches for added strength at journal transitions
• Tolerances: Held to ±.0001 inches — among the tightest in the racing industry
• Counterweight Placement: Optimized for improved rotating assembly balance and performance

Suitable for applications ranging from high-performance muscle car builds to dedicated drag race engines, the 426-3750MC6F pairs with standard Big Block Mopar rotating assembly components. The nitriding process hardens the journals without the risk of softening between journals or post-run deformation, ensuring long-term reliability under extreme loads.