I have a Blockmaster block and head mill, with about an 18" wheel-type cutter head, with 40 or so carbide cutters. It handles everything up to Cummins 855 diesel engines, and all automotive blocks, heads, and manifolds. Most shops use a big belt sander, or something similar, for manifolds.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!