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The Austin-Healey 4000 was a British car built in 1968. Only 3 examples were made.

The problem facing the Austin-Healey 3000 in 1968 was the fact that the aged C-series Austin engine that powered Healey cars was soon ending it's production run production. Donald Healey and his colleagues at BMC came up with a radical solution, they would fit the 3000 with the Rolls-Royce FB60 inlet over-exhaust engine. The new car would be lengthened by six inches to that it could accept the engine and was christened the Austin-Healey 4000.

The FB60 engine was not a military engine although it derived from the B40/B60/B80 family of Rolls-Royce military power units. In essence the FB60 was an alloy-block version of the B60, with a different bore and stroke. It was first seen at the end of the fifties in a prototype monocoque Bentley (the Bentley Java intended to replace the S1/S2. This project eventually evolved into the V8-powered Shadow/T-type cars.

Fed by twin 2in SU carburetors, and with hydraulic tappets and a low compression ratio of 7.8 to 1, the FB engine delivered 175 bhp at 4800 rpm, with maximum torque of 218lb ft at 3000 rpm.