S&S KN421 Camshaft for Harley Davidson 1936-47 OHV Big Twin models
Intended for large displacement engines such as the 103in. engines produced by the original Flathead Power company. .420in. valve lift with longer duration than the KN420. Special high-lift valve springs are required.
Bike Fitment 1936-1947 Harley Davidson E 1936-1947 Harley Davidson EL 1941-1947 Harley Davidson F 1941-1947 Harley Davidson FL
Flathead power KN-Series engines
Quality construction, made in-house by S&S Cycle in Viola, Wl
Higher lift and increased valve timing for better performance