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Which spark plugs for a 250 Chev/165 Mercruiser by postie

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  • Which spark plugs for a 250 Chev/165 Mercruiser by postie

    Recovered Thread: Which spark plugs for a 250 Chev/165 Mercruiser by postie on 06-13-2011.

    Regards,

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    06-13-2011 #1
    postie

    Join Date
    May 2007
    Location
    Victoria B.C.
    Posts
    79

    Which spark plugs for a 250 Chev/165 Mercruiser

    I was just wondering what spark plugs other owners are using. Unfortunately my motor was a remanufacture done by a company now out of business so I have no idea what year it is or if it is a marine or auto motor-if that makes any difference. Right now I have NGK GR 4 but not sure if that is the right plug.




    06-15-2011 #2
    TheWhitePossum


    Join Date
    Jan 2008
    Location
    Tacoma
    Posts
    277

    If you have an earlier motor that uses 13/16 inch plugs, I like the NGK BR6ES. If you have a newer model it will use 5/8 inch plugs. Mercruiser called for AC-R-43T but I have also had good results with an RV8C. Hope this helps.

    The White Possum
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