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The AC Light Six was made between 1921 and 1930.

The car featured a 6 cylinder 1991cc engine with a single overhead camshaft, which was able to produce between 35 and 40 hp.

The design had many design innovations such as steel wet liners that were pressed into an aluminium block and the engine assembly clamped between the cast-iron head and the crankcase by long studs.

The crankshaft was made from steel by Vickers and run in four bearings. The engine had lightweight alloy Ricardo pistons and steel connecting rods.

The car cost £550 new in 1921 and £495 new in 1928.

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