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  1. J

    Setting the Timing on a 1978 Mercruiser MCM 140

    I rebuilt a 1978 Mercruiser MCM 140 and got great help from this site. I am all done, it runs great, but I want to set the timing so it's perfect and I can enjoy it without worrying about it. Ignition timing is supposed to set at 6 degrees BTDC. I can't find the line I'm supposed to see (lots of...
  2. J

    78 Merc MCM140 I/0-Cracked Head

    Is there anyplace I can find a used cylinder head. A new one from Mercruiser is $620. That comes as a whole assembly (valves & everything included), but I don't need the valves. I am looking for-just the metal block part to try and keep the cost down. I can reuse my valves. Is there a boat...
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