Replacement cylinder kit with 8.2:1 compression pistons for 3-5/8" bore x 4-1/2" stroke Flathead Power® KN-Series engines. Made from the same engineering grade alloyed grey cast iron as our cylinders for shovelhead engines, cylinders for KN-Series engines exhibit excellent strength, wear characteristics, and dimensional stability. Thicker critical sections and increased fin area provide extra strength and improved cooling. The tough black powdercoat finish looks like stock but resists rust and stone chips much better. These cylinders and pistons may also be used in modified 3-5/8" bore Harley-Davidson® knucklehead engines. 5.625" cylinder length.
