[vincent]

Put your head with the chambers down on the mills table and underlay the banana with shims as best as you can before tightening down thus holding the warped head in its true warped stage on the table. Do a small fly cut on every bolthole surface, of course all to the same depth. When finished you have 24 points to lay the head on, all of them in the same plane and level. When head is mounted on these points and tightened down on the table you can skim the gasket surface and get a straight and flat head again.