Eagle Specialty Products 515004155 Competition Rotating Assembly Pontiac - 400 461ci

The Eagle Specialty Products 515004155 is a high-performance competition rotating assembly engineered for Pontiac 400 engines, delivering 461 cubic inches of displacement. This complete kit is built for serious racing applications including nitrous oxide and forced induction systems, making it ideal for street/strip and dedicated competition builds.

Complete Assembly Includes:

• 4.250-inch stroke forged 4340 steel crankshaft
• 6.800-inch forged 4340 steel H-beam connecting rods with 7/16-inch ARP 8740 bolts
• 4.155-inch bore Mahle forged 4032 aluminum pistons with -6cc flat top design
• Plasma-moly file-fit piston rings
• King XP series rod and main bearings

Premium Construction:

Eagle's forged 4340 chromoly steel crankshaft and H-beam connecting rods are manufactured using a two-piece forging process that orients the grain structure to handle extreme loads. The rods feature fully machined and shot-peened surfaces, with sizing held to exact tolerances using Sunnen Krossgrinding technology. Weight-matched components ensure smooth, balanced operation at high RPM.

The Mahle forged pistons are precision-machined from heat-treated 4032 aluminum alloy for superior strength and thermal stability. The flat top design with valve reliefs provides an efficient combustion chamber shape for excellent power production.

Performance Notes:

This assembly is designed for internal balance configuration. Note that it is not compatible with 1976 Pontiac 400 blocks due to factory notches at the top of cylinders. Recommended for builds targeting up to 700+ horsepower.