Eagle Specialty Products 524104155 Pontiac 400 Rotating Assembly 461ci Stroker Kit 4.250 Stroke

The Eagle Specialty Products 524104155 is a complete Street & Strip rotating assembly designed for Pontiac 400 engines, creating a powerful 461 cubic inch stroker combination. This comprehensive kit features a cast steel crankshaft with 4.250-inch stroke, 6.800-inch forged I-beam connecting rods with 7/16-inch ARP 8740 bolts, Mahle 4032 forged pistons with -6cc flat top design sized at 4.155-inch bore, plasma-moly file-fit rings, and performance street bearings.

Key Features:

• Cast steel crankshaft with 4.250-inch stroke and typical weight of 68 lbs
• Forged 5140 steel I-beam connecting rods measuring 6.800 inches in length
• Mahle 4032 forged flat top pistons with -6cc dish for optimal compression
• ARP 8740 rod bolts (7/16-inch) for superior strength and reliability
• Plasma-moly file-fit piston rings for precise gap control
• King or Clevite performance street bearings included
• Designed for internal balance applications

Technical Specifications:

• Displacement: 461 cubic inches with 4.155-inch bore (+.030 over standard)
• Standard Pontiac 400 bore: 4.120 inches
• Rod journal diameter: 2.200 inches
• Main journal diameter: 3.000 inches
• Wrist pin size: 0.990 inches
• Compression ratios: 11.0:1 (75cc), 10.1:1 (85cc), 8.3:1 (111cc) with .040-inch head gasket

Important Notes:

• Not compatible with 1967 Pontiac 400 blocks due to factory reliefs at the top of cylinders
• Assembly must be balanced by a qualified machine shop before installation
• Flywheel/flexplate and harmonic balancer not included
• Suitable for street engines producing under 700 horsepower

Eagle Street & Strip rotating assemblies offer the perfect balance of reliability, affordability, and performance for pump gas, naturally aspirated street applications. Each component is precisely manufactured to strict tolerances ensuring proper fitment and long-lasting durability in demanding performance environments.