SKU: EAGB15404E040
UPC: 793348805573
MPN: B15404E040
The SBC Balanced Rotating Assembly 383 .040 by Eagle is a complete, ready-to-install crank and piston assembly engineered for serious marine and high-performance engine builders who demand precision and reliability. This balanced rotating assembly is purpose-built for small-block Chevrolet platforms and serves boaters, marine mechanics, and engine shops looking to maximize durability and performance on the water. Whether you're rebuilding a fishing vessel, performance ski boat, or preparing a marine engine for heavy use, this assembly eliminates the guesswork of individual component matching and tuning.
The 383 cubic-inch displacement with .040-inch overbore provides increased swept volume and power output compared to stock 350 configurations, delivering the extra torque and top-end performance that marine applications demand. Eagle's factory-balanced rotating assembly—combining the crankshaft, connecting rods, and pistons as a single unit—ensures perfect dynamic balance, reducing vibration and stress on engine bearings during sustained high-RPM operation. The .040-inch overbore spec allows for piston ring compatibility with modern fuel blends and marine-grade oil, critical for saltwater and freshwater engine longevity in demanding boating environments.
This assembly is ideal for marine engine rebuilds, performance upgrades, and custom installations in small-block Chevrolet-based marine powerplants used in pleasure craft, commercial fishing vessels, and high-performance watercraft. Professional installers and experienced builders appreciate the time savings and dimensional accuracy of a pre-balanced assembly, eliminating the need for separate balancing work and reducing assembly labor. Weighing 102.1 lbs and fitting standard SBC mounting configurations, the SBC Balanced Rotating Assembly 383 .040 integrates seamlessly into existing marine engine blocks and is compatible with standard small-block Chevrolet intake and exhaust manifolds commonly found in marine engine installations.
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