Eagle Crankshaft - 3.500" Stroke - Internal Balance - Steel - 2 Piece Seal - SB Chevy 56 375 lb/in Spring Rate

375 lb/in Spring Rate

34 in Long Back

PRO 1 heads are engineered for easy installation

ensuring a straight rear end while eliminating inconsistent spring rates

Mazda Miata 1990-97

Eagle Crankshaft - 3.500" Stroke - Internal Balance - Steel - 2 Piece Seal - SB Chevy 56 375 lb/in Spring RateEagle lightweight forged 4340 steel cranks feature a non twist forging, . 125" fillet radiuses for improved strength so chamfered narrowed bearings required, nitrided surface, &amp micropolished to &lt 2 ra. For naturally aspirated racingForged 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