Harley-Davidson Ironhead engine
The ironhead was a Harley-Davidson motorcycle engine, so named because of the composition of the cylinder heads. The engine is a two cylinder, two valves per cylinder, pushrod V-twin. It was produced from 1957 until 1985 and was replaced by the Evolution engine in 1986.
This name may also be applied to the Harley-Davidson Sportster motorcycles that used this engine.
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