BBM RB 4340 Forged Crank 4.375 Stroke

The EAGLE BBM RB 4340 Forged Crank with 4.375 stroke is a premium forged crankshaft designed for serious engine builders and high-performance automotive enthusiasts. This component is essential for any stroker or high-displacement build, engineered to withstand elevated horsepower and torque loads that cast cranks cannot endure. Whether for street performance engines or competition drag units, this forged crank provides the strength and precision necessary for reliable operation.

Constructed from 4340 alloy steel, the EAGLE BBM RB forged crank offers excellent fatigue resistance and impact strength, making it suitable for high-rpm applications. The 4.375-inch stroke geometry enhances piston dwell time and displacement, improving breathing efficiency and torque production. EAGLE's precision forging process ensures a consistent grain structure, reducing the risk of weaknesses that can occur in cast cranks.

This forged crank is ideal for builders working with small-block platforms that require stroker displacement increases. Its robust design accommodates modern high-flow oiling strategies and heavy-duty bearing packages, which are critical for engines operating under sustained elevated boost or nitrous levels. Engine builders looking for durability and performance will find this crankshaft to be a reliable choice.