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Spark plug

"w/o price concern, get the ne

"w/o price concern, get the new AC Delco platinum marine plugs. Not sure of the number. Call your marina."
 
"[b]"what is the very best

""what is the very best spark plug to use in a gm 350 5.7 mercruiser ?"

Ayuh,...
The AC Delco, MR43T....
Up to 96, or 97,...

Then there's an "S" or an "L" after the #... Don't remember...
It's the longer reach plug for the Vortec heads..."
 
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