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| Manufacturer | Harley-Davidson |
|---|---|
| Also called | XL |
| Production | 1957 to 1985 |
| Predecessor | Harley-Davidson KHK |
The ironhead was a Harley-Davidson motorcycle engine, so named because of the composition of the cylinder heads (Iron instead of Aluminium). 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 was applied to the Harley-Davidson Sportster motorcycles that used this engine.
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