The
Austin Healey final "
100" models, 1956's "
BN4" (2+2 seats) and 1958's "
BN6" (2 seats) were six-cylinder
100-Six cars.

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Austin Healay CarsTo make room for the occasional seats the wheelbase was increased by 2 in (50.8 mm). The bonnet had a built-in air scoop and the windscreen no longer could be folded down.

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Austin Healay CarsThe cars used a tuned version of the
BMC C-Series engine previously fitted to Austin Westminster which at first produced 102 bhp (76 kW) increasing to 117 bhp (87 kW) in 1957 by fitting a revised manifold and cylinder head. The overdrive unit became an option rather than a standard fitting.

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Austin Healay CarsIn late 1957 production was transferred from Longbridge to the
MG plant at Abingdon.

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Austin Healay CarsA 117 bhp (87 kW)
BN6 was tested by The Motor magazine in 1959 had a top speed of 103.9 mph (167.2 km/h) and could accelerate from 0-60 mph (97 km/h) in 10.7 seconds. A fuel consumption of 20.8 miles per imperial gallon (13.6 L/100 km; 17.3 mpg-US) was recorded. The test car cost £1307 including taxes of £436.