BBC 4340 Forged Crank - 4.750 Stroke

The BBC 4340 Forged Crank with 4.750 stroke is a precision-engineered crankshaft designed for serious big block Chevy engine builders and performance enthusiasts. Built for high-displacement applications, this forged steel component serves as the backbone of any big block Chevy powerplant requiring a long-stroke geometry. Whether you're assembling a classic muscle car engine, building a street performance build, or developing a competition-grade power unit, this crankshaft delivers the structural integrity and dimensional accuracy necessary for reliable operation at elevated RPM and boost levels.

Manufactured from premium 4340 forged steel, this crankshaft exhibits superior strength-to-weight characteristics compared to cast alternatives, making it ideal for demanding racing and high-performance applications. The 4.750-inch stroke dimension creates a longer piston travel path, increasing displacement per revolution and enhancing torque output across mid to lower RPM ranges. The internal balance design distributes rotating mass evenly, reducing vibration and extending bearing life under sustained load. The two-piece seal configuration ensures reliable oil retention and compatibility with modern engine sealing standards, while the forged construction minimizes stress concentrations that can lead to fatigue failure in cast designs.

This crankshaft is best suited for engine builders working with big block Chevy platforms (BBC) who require maximum displacement and torque characteristics. It excels in applications ranging from street engines to strip-and-road machines where the long stroke translates to improved low-end power delivery. Proper installation requires professional machine work to ensure journal alignment and bearing clearance specifications are met. This component is sold individually and must be paired with compatible connecting rods, pistons, and block work to achieve optimal performance and longevity in your engine assembly.