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    84' 3.0 Block & 91' HO Head Tuning?

    Good evening all, Recently swapped heads on the old 1984 MCM 140 3.0 in the Chris Craft. Couldn't find the old style large port head, so had to go with the 1991+ high output head. Still using old manifold and carb, despite non perfect port alignment. Engine starts and runs well, but backfires...
  2. C

    1984 MCM 3.0 New Head

    Good afternoon all, Have a 1984 MCM 140 3.0 Liter that developed a pinhole leak in the number 4 exhaust port on the head. Can't find a new "big port" head, so bought a "high flow" head for 1991 and newer 3 liters, and the adapter to mate up the old manifold. The adapter is 5/8 inches wide...
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