Engine type, in mechanic shorthand (anagram of OH, DC)

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Possible Answers: DOHC.

Random information on the term “DOHC”:

The cam-in-block valvetrain layout of piston engines is one where the camshaft is placed within the cylinder block, usually beside and slightly above the crankshaft in a straight engine or directly above the crankshaft in the V of a V engine. This contrasts with an overhead camshaft (OHC) design which places the camshafts within the cylinder head and drives the valves directly or through short rocker arms.
Taken from Wikipedia