Eagle Chevy 400 Heavy Duty Assembly 401 Cid / 4.125in Bore Size / -28cc

If you're building a serious performance engine for your Chevy 400, especially one that will see extreme use like exotic fuels, heavy nitrous, or high boost, a robust rotating assembly is the heart of the matter. This Eagle Heavy Duty Rotating Assembly is designed to handle those demanding conditions, giving you a solid foundation for a powerful engine.

At its core is a 3.750-inch forged 4340 steel crankshaft, known for its strength and durability under high stress. Paired with this are 6.000-inch H-beam connecting rods, which are a popular choice for their strength-to-weight ratio. These rods come equipped with 7/16-inch ARP 2000 bolts, a well-regarded fastener system that ensures reliable clamping force even under extreme cylinder pressures. The assembly includes 4.125-inch bore pistons from JE, featuring an inverted dome design with a -28cc volume, specifically made for forced induction applications. These pistons are paired with plasma-moly file-fit rings, allowing for precise gap setting to optimize performance and sealing. For the bearings, Eagle has included King XP rod and main bearings, which are recognized for their performance and wear resistance in high-stress environments.

This assembly is a comprehensive package for those pushing the limits of their engine. Please note that this part is not CARB approved and cannot be shipped to California. It also carries a Prop 65 warning.