61" Knucklehead Cylinder Piston Kit

Replacement 61" Knucklehead cylinder and piston kit features cast iron construction with 5 fins above head bold line. Original markings with a black finish. Honed and pre fitted with 7.5:1 compression cast pistons and rings.
Cylinders feature four fins. They are ready to run and will require break-in. Please refer to proper shop manual for suggestions on break-in. For stock stroke only. For 1936-1947 Knuckleheads. *NOTE: All cast iron cylinders have same piston to wall clearance .0025 -.003. *NOTE: Replacement type cylinder kits do not have original motorcast markings on the cylinder base. Cylinder do not include factory casting numbers.