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S&S Flathead Power Series KN style Knucklehead engines
S&S Power Series KN engine and cylinder assemblies, specifically designed for Knucklehead and Flathead style engines. Includes cylinder kits, cylinder heads, pistons, and connecting rods for restoration and performance enhancement on Harley-Davidson motorcycles with Knucklehead (1936–1947) and Flathead (1929–1965) engines.
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S&S CYCLES&S Flathead Power Series KN style Knucklehead engines – 3 5/8″ / 4 1/2″
Version: Motor de estilo generador KN93, agujero 3 5/8", trazo 4 1/2", leva S&S 420 y compresión 8.2:1Size: 3 5/8" / 4 1/2"The S&S KN Series engines are very similar in appearance to the original Knucklehead engines, but feature a…
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S&S CYCLES&S Flathead Power Series KN style Knucklehead engines – 3 5/8″ / 4 1/2″
Version: Motor de estilo generador/alternador KN93, agujero 3 5/8", trazo 4 1/2", leva S&S 420 y compresión 8.2:1Size: 3 5/8" / 4 1/2"The S&S KN Series engines are very similar in appearance to the original Knucklehead engines, but feature a…
About this category
These components are optimised to deliver increased airflow and power while retaining classic aesthetics. Compatible with side-valve and OHV engine configurations. Ideal for authentic restoration projects or custom motorcycles with Knucklehead/Flathead engines seeking modern reliability and power. S&S references such as 474C or 640.