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  1. C

    5.0 Mercruiser T.I. Spark Plugs

    Awesome, it is carbureted, I'll more than likely see what NGK will take the place of the AC Delco and go from there. I appreciate it!
  2. C

    5.0 Mercruiser T.I. Spark Plugs

    Thank you! Thunderbolt Ignition, it is carbureted.
  3. C

    5.0 Mercruiser T.I. Spark Plugs

    I'm trying to figure out which spark plugs are correct for my Mercruiser 5.0. I searched the serial number off the Aluminum plate off the engine block but I haven't found any helpful info. I might be missing a couple letters or something. The Serial number that I can see is 616838. The boat is a...
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