Eagle BB Chevy 4340 Forged Crank - 4.250 Stroke - L/W 30010BK 1955-1966 Pontiac Star Chief

1955-1966 Pontiac Star Chief

Made from 1/8" High Impact mirror grade plastic material

Manual wing adjuster is for sprint car top wings when rules do not permit the use of hydraulic cylinders

It is designed for circle track applications where a stock appearing oil pan is required

Eagle BB Chevy 4340 Forged Crank - 4.250 Stroke - L/W 30010BK 1955-1966 Pontiac Star ChiefEagle forged 4340 steel cranks feature a non twist forging, . 125" fillet radiuses for superior strength so chamfered narrowed bearings required, nitrided surface, &amp micropolished to &lt 2 ra. Intended for the most demanding applicationForged AISI ASME certified 4340 steel with multi stage heat treatment for superior strength Service: Eagle connecting rods and cranks are designed and manufactured to our specifications. Some simply purchase generic