Spark Plug Type MerCruiser MCM 4.3 L V6
Question
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Answer ( 1 )
The factory service manual recommends two brands of spark plugs. Which one you choose is up to you. You can use AC Delco or Champion.
Here are links to the correct type of spark plugs:
AC Delco spark plugs: https://amzn.to/39YySNa
Champion spark plugs: https://amzn.to/2MKVk3v
Here is a screenshot of spark plug specifications from the factory service manual.

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Notations: Sea Rap to MerCruiser cross references include;
4.3L-2 same as MCM 4.3L
4.3L-4 same as MCM 4.3LX