Eagle BB Chevy 4340 Forged Crank - 4.375 Stroke - L/W Pyrotect the Pro-Fit provides superior softness

the Pro-Fit provides superior softness and stretchability

1800-2200 RPM Stall

GM HEI 4 Pin

1968-1981 Mercury Cougar

Eagle BB Chevy 4340 Forged Crank - 4.375 Stroke - L/W Pyrotect the Pro-Fit provides superior softnessEagle 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