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I think Gary was looking for numbers for a certain amount of recommendable milling. Most comments about the standard A head do not recommend it for anything except authentic restoration. For the last 18 months of production I would look for the so called Police Head. The great availability of high compression heads for the Model A head has brought down the price of these Ford made high(higher) compression to make them a good value where authenticity counts for anything. The Brumfield heads, being out of print, leaves adequate other choices. Being blessed with many swap meet finds, the Model B head offers the least for the most money where the project is not restoration of a Model B.