61" Rear MC Cast Knucklehead Cylinder

Rear cylinder fits Knucklehead 1936-1947 61" models. Cylinders are for stock bore, stock stroke and compression, featuring 5 fins.
Cylinder have original casting marks of MoCasCo. Set includes 61" overhead valve piston ring set. *NOTE: Check ring gap before final assembly. Include casting numbers on cylinder. *NOTE: All cast iron cylinders have same piston to wall clearance .0025 -.003.