Eagle Specialty Products 435140006200 Forged 4340 Steel Crankshaft Ford 351W 4.000" Stroke

The Eagle Specialty Products 435140006200 is a high-performance forged 4340 steel crankshaft engineered for Ford 351 Windsor engines with a 4.000-inch stroke, ideal for 408 cubic inch stroker builds. This premium crankshaft is designed for demanding racing and high-performance street applications rated up to 1500 horsepower.

Construction and Manufacturing:

• Forged from certified 4340 steel using non-twist forging process
• Multi-stage heat-treatment for maximum strength and durability
• Stress-relieved and shot-peened to resist fatigue
• X-rayed, magnafluxed, and sonic-tested for quality assurance
• Nitrided surface with journals micro-polished to less than 2 RA

Technical Specifications:

• Stroke: 4.000 inches (408 stroker configuration)
• Main journal diameter: 3.000 inches
• Rod journal diameter: 2.100 inches
• Rod journal width: 1.900 inches
• Minimum rod length: 6.200 inches or longer
• Internal balance with target bobweight of 1900 grams (±2%)
• Fillet radius: 0.125 inches for superior strength (requires chamfered bearings)
• Snout diameter: 1.375 inches
• Balancer bolt thread: 5/8-18
• Flywheel mounting: 6-bolt pattern
• Fits 1-piece or 2-piece rear main seal blocks

Features:

• Chamfered oil holes for improved oiling efficiency
• Precision-ground and micro-polished journals
• Target bobweight within ±2% to reduce balancing time
• Standard weight design (approximately 61 lbs)

Important Note: This crankshaft must be balanced to match your specific connecting rods and pistons. Chamfered or narrowed bearings are required due to the 0.125-inch fillet radius. Professional installation and balancing recommended.