What spark plugs for 1988 454 Merc Mag?

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04-18-2012 | 09:54 PM

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From: St. Clair Shores, Mi

What spark plugs for 1988 454 Merc Mag?

I've searched the site and google, but can't find a definitive answer. What does Merc recommend? Anyone have better luck with a different plug? Any garbage plugs to stay away from? What is the recommended gap? Thanks,

Eric

04-18-2012 | 11:02 PM

DareDevil

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Ngk 6

04-18-2012 | 11:11 PM

legend

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MR43T but look and see what you take out. GM used a short electrode and a long.

04-19-2012 | 04:20 PM

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Thanks legend

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