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In recent years the BMW K100 2valve and 4valve engines, as well as the later variants the K1100 and K1200 4valve engines, have provided Austin/ Rover classic Mini and MG enthusiasts with a cylinder head that closely matches the bore centers of the age old Austin Rover 'A' series 1275cc engine. In fact three of the originally head studs of 'A' series engine block line up with those of the BMW cylinder head. Miss alignment of the chambers from a 'bolt on' stand point, is only around 1mm front to back, and 2mm end to end. The cylinder head itself needs slight modification so it can live in an upright orientation, and converted to run a sychronous belt to drive the camshafts from the engines crankshaft. The engine block needs further modification to accept the new stud pattern of the BMW cylinder head.
Popularised by a handfull of companies, this conversion has seen power outputs so far in excess of 230bhp by forced induction, from only a 1.3 litre engine. Thats more than 175bhp per litre. Most however are of similar power outputs of the engines these heads are taken from.

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