With the Formula 1 championship success of Mercedes Benz in 1954 and 55, other manufacturers took notice. Norton, in search of more power in 1957, built an experimental desmodromic version of the 350 and 500 Manx. For simplification both engines used the same bore.
Both engines were raced at various times in 1959 and 60 but did not show enough advantage over the valve spring version to continue development and the project faded away.
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| Classic Bike May 1998 |
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