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In page Fairthorpe Cars:

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The Zeta was introduced in 1959, powered by a modified six-cylinder Ford Zephyr engine of 2553 cc. It was offered in a choice of three stages of tune, with up to six carburettors and a BRM cylinder head, priced at £1,198, £1,281 and £1,407 respectively; the basic kit was available for £740.[1] Very few, probably five, were made.[2]