Eagle SB Mopar Cast Steel Crank - 4.000 Stroke 421992 These springs will your 1964-1972

These springs will your 1964-1972 GM A-body

Drill sheet metal and aluminum without deforming or distorting

Belt ends are high quality 4130 chrome moly steel

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Eagle SB Mopar Cast Steel Crank - 4.000 Stroke 421992 These springs will your 1964-1972Eagle cast crankshaft is an upgrade from an O. E. crankshaft. Recommended for use in pump gas, naturally aspirated, non competition road cars. Cast steel for strength improvement over cast iron. Service: Eagle connecting rods and cranks are designed and manufactured to our specifications. Some simply purchase generic products and package in their boxes without having any control or input in production. Eagle uses only certified steel in production of