NGK BR6FS plugs taper or gasket seal ? 72 Mercruiser 140HP (uses NGK BR6ES)

[fishrdan]

Are NGK BR6FS spark plugs taper of gasket sealed?

I have a 72 140HP Mercruiser and looking to get NGK plugs for it , but not sure what the NGK correct plug would be for the old engine, it uses gasket sealed plugs. Ran through the search function and everyone was mentioning the BR6FS plugs, even on some 70's GM engines, but I'm under the impression these are taper seat plugs as I saw mention that the 80's and 90's engines used them also.

I found BR6ES plugs while crossing the old plug numbers (Autolite 404, Champion CR44n, etc) and not sure if these are correct either?

Suggestions on good plugs for this old engine, I have ol'cheap'o Bosch's in there now.

Thanks, Dan

 

[fishrdan]

Re: NGK BR6FS plugs taper or gasket seal ? 72 Mercruiser 140HP

Re: NGK BR6FS plugs taper or gasket seal ? 72 Mercruiser 140HP

I figured it out, went to NGK's website and they had a good picture of the BR6FS plug, it was taper seat.

Believe it or not, they have a "Part Finder" with marine applications, my ol' 140HP takes the BR6ES I mentioned in the previous post.