Eagle 440038756000; Forged 3.875 Stroke, 6 in. Rod, Int Bal for 421 SBC. Material:Forged 4340 Steel. Stroke:3.875 in. Eagle forged 4340 steel Cranks feature a non-twist forging. 125" fillet radiuses for superior strength so chamfered / narrowed bearings required, nitrided surface and micropolished.
