Eagle Billet Steel Crankshaft - 4 in Stroke - Internal Balance - 1-Piece Seal - 58X Reluctor - GM LS-Series CLASN73Z-GM They are cast from A356

They are cast from A356 aluminum and heat treated to T6 specifications

It is primarily designed for use in racing applications and will require the use of longer than stock mounting bolts

Aluminum U-joint girdles replace standard steel U-bolts and provide more surface clamping area for 1310 and 1330 (1-1/16") U-joint caps

Fitting / Brackets / Hardware / Hose

1967-1974 Chevrolet G10 Van

Eagle Billet Steel Crankshaft - 4 in Stroke - Internal Balance - 1-Piece Seal - 58X Reluctor - GM LS-Series CLASN73Z-GM They are cast from A356Product Description: Crankshaft 4. 000 in Stroke Internal Balance 58X Reluctor Billet Steel 1 Piece Seal GM LS Series Eagle Specialty Products provides quality engine parts to some of the worldas most respected engine builders. Unlike some manufacturers Eagle never compromises quality for the sake of a lower price. Eagle Specialty Products use only the newest, state of the art equipment and highly skilled craftsmen to produce every part they sell. All