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Jaguar XK 3.4-litre six

From 1955 the works D-Types were fitted with a new cylinder head that gave the inlet valves a greater inclination to allow them ot be increased in diameter.

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Karl Ludvigsen
Karl Ludvigsen

In addition to his motor industry activities as an executive (with GM, Fiat and Ford) and head of a consulting company, Karl Ludvigsen has been active for over 50 years as an author and historian. As an author, co-author or editor he has some four dozen books to his credit. Needless to say, they are all about cars and the motor industry, Karl's life-long passion.

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