SBF 4340 Forged Crank - 4.000 Stroke

The EAGLE SBF 4340 Forged Crank with 4.000 stroke is a premium crankshaft engineered for small block Ford engine builders and performance enthusiasts who demand reliability and durability. This forged steel component is the rotating backbone of any high-performance or stock engine rebuild, converting reciprocating piston motion into rotational power with precision. Whether you're assembling a street engine, competition platform, or restoration project, the SBF 4340 Forged Crank delivers the strength and dimensional accuracy required for sustained operation under load.

Manufactured from 4340 forged steel, this crankshaft exhibits superior fatigue resistance and tensile strength compared to cast alternatives, making it the preferred choice for applications exceeding stock power levels. The 4.000-inch stroke dimension determines engine displacement when paired with specific bore sizes and is optimized for small block Ford platform compatibility. Internal balance design eliminates the need for external counterweights, reducing rotating mass and improving overall engine efficiency. The crankshaft accommodates either 1-piece or 2-piece rear seal configurations, providing flexibility during engine assembly to match your existing block specifications and oil pan setup.

Engine builders, machine shops, and dedicated mechanics trust the SBF 4340 Forged Crank for small block Ford applications ranging from 289 cubic inch to 347 cubic inch displacements. This crankshaft integrates seamlessly with standard small block Ford blocks, connecting rod journals, and main bearing specifications established across generations of the platform. Installation requires proper balancing, journal inspection, and bearing clearance verification by a qualified machine shop to ensure optimal performance and longevity. The substantial 67-pound weight reflects the density and durability of premium forged steel construction, delivering peace of mind for demanding engine duty cycles.