On the 2008 Fat Boy, there's an Engine4 Air-cooled, Twim Cam 96B. It aslo has valves pushrod-operated, overhead valves with hydraulic, self-adjusting lifters with two valves per cylinder.
To me, the fat boy is one of the most recognizable motorcycles on the rode. It rides like a dream, which is why its been on the market for 18 years strong.