V-twin had 3-valve heads.

* Four-valve cylinder headThis is the most common type of multi-valve head, with two exhaust valves and two similar (or slightly larger) inlet valves. This design allows similar breathing as compared to a three-valve head, and as the small exhaust valves allow high rpm, this design is very suitable for high power outputs.

* Five-valve cylinder headLess common is the five-valve head, with two exhaust valves and three inlet valves. All five valves are similar

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