Rare FLH with Sidecar! - 60hp 74C.I. Panhead - Excellent Restoration By the mid 1940s the Knucklehead installed in Harley-Davidson's first overhead-valve twin-cylinder roadster was beginning to show its age, prompting the Milwaukee firm to engage in a wholesale revision of the engine for 1948, the new top end giving rise to the unofficial nickname 'Panhead'. While the engine's bottom end remain...