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Retro Breathers feature classic styling with a two piece design for easy maintenance
Hex Hose Finisher 1-15/16" (49mm) I
Reduces oil flow to the upper engine assembly
Nitronic stainless steel is used for the valve seat
AF931-12-10
Callies Magnum Series Forged 4340 Crankshaft for Small Block Chevy CASMJ21A-MG Product:3.750" Stroke, 2.100" Pin, 400 Mains with Big Block Chevy Snout Retro Breathers feature classic stylingCallies Magnum Series Forged 4340 Crankshaft for Small Block Chevy3. 750" Stroke, 2. 100" Pin, 400 Mains with Big Block Chevy Snout CASMJ21A MG SMJ21A MG After years of service, Magnum crankshafts by Callies have established themselves as one of the most durable competition crankshafts ever produced. Magnum crankshafts are manufactured from ultra pure SAE 4340 steel. Callies then subjects this material to multiple heat treatments, resulting in a
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