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Like Hans mentioned, most shops Always surface grind the head during a removal. So first, measure any heads that you are working with... my Factory Volvo Manual (1974) says that a standard B20F head is 87.0 mm or 3.420" and the B20E head is 84.9mm or 3.340". It says the height is measured from the gasket surface to the cyl. hd. bolt, machined surface. It also says that the Head Gasket is the same for these two engines at, 1.2mm .047" (unloaded) and 1.0mm or .039" (loaded).
Says the B20A is the same 87mm dimension and 1.2mm Hd. Gasket. The B20B head is 86.2mm's(3.390") and uses a .8mm unloaded /.7mm loaded. HTH, Tom
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