To my knowledge also, Alpina did not work on the 745i turbo engine. Is your engine a turbo one or a straight 6? do you have a 4 digit number on the head?
I cannot read the numbers on the block. Have you tried to spray some degrip oil on it, then rub a little to clean it? sometimes, it help to read it clearly. But i do not see the * in front and back, that generally surround the alpina numbers.
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