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I have a 1989 MCM 5.0/LX 305 230 Hp engine. Eng # OC535063
The manual call for AC.MR44T plugs.
My local marine did not have them. They said mercury recommends
NGK-BR6FS.
Would these be OK?
Never buy anything from a marina except sodas and chips and even they are usually cheaper at 7-11 as over priced as they are.
The right heat range, cross-over plug and you should be fine.
What ever the book says I always tend to cross them over to AC's and run them. AC's for me are "Like rounds in a chamber" compared to other plugs.
