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Thread: Spark plug #'s and what Engines they fit

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    Charter Member #11 IrishTornado's Avatar
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    Spark plug #'s and what Engines they fit

    NGK Plugs":

    Iridium part# for cross on most GM Big Blocks
    NGK Iridium BR6FSIX

    454 Mag- BR6FS....BR6FIX-(Iridium)

    HP500/HP500efi- Iridium BR6FSIX

    502 Mags -BR6FS...BR6FIX-(Iridium)

    7.4 MPI -BPR6EFS....BR6FIX-(Iridium)

    496 8.1 Mag/HO- TR55IX-(Iridium)...PZTR5A-15 -(Platinum)

    6.2L MPI-TR55...TR55IX-(Iridium)...PZTR5A-15-(Platinum)

    Most 350's- BR6FS

    700sci's use NGK BPR6ES
    Last edited by IrishTornado; 05-18-2010 at 02:34 PM.

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    Charter Member #5 MRBAJA's Avatar
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    Re: Spark plug #'s and what Engines they fit

    AWESOME IRISH!!! Thanks so much for posting! Have no idea how you knew that some of us were wondering the part numbers

    I'll take 16 of the HO plugs and 5 pkgs of band-aids for my knuckles and a bottle of Tito for afterwords.

    <EDIT>....

    Now I am confused. I did a search online for the part # above for the HO.... couldn't find. So I went to NGK's site....and this is what it gave me? What's right? Or are they the same?

    MERCRUISER 496 Mag HO Stern Drive 8 cyl Chevrolet Big Block

    Spark Plug Part No. Stock No. Plug Gap Photo
    Iridium TR55IX 7164 0.06
    Last edited by MRBAJA; 05-18-2010 at 02:16 PM. Reason: info?

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    Charter Member #11 IrishTornado's Avatar
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    Re: Spark plug #'s and what Engines they fit

    Quote Originally Posted by MRBAJA View Post
    AWESOME IRISH!!! Thanks so much for posting! Have no idea how you knew that some of us were wondering the part numbers

    I'll take 16 of the HO plugs and 5 pkgs of band-aids for my knuckles and a bottle of Tito for afterwords.

    <EDIT>....

    Now I am confused. I did a search online for the part # above for the HO.... couldn't find. So I went to NGK's site....and this is what it gave me? What's right? Or are they the same?

    MERCRUISER 496 Mag HO Stern Drive 8 cyl Chevrolet Big Block

    Spark Plug Part No. Stock No. Plug Gap Photo
    Iridium TR55IX 7164 0.06
    You are correct and I edited above post to correct this.

    Anyone else come across any part #'s that could help the DIY guys feel free to add to this.

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    Re: Spark plug #'s and what Engines they fit

    I put about a $250 set of digital calipers on 4 of the NGK plugs I bought to put it the 30 yesterday. I had gaps ranging from .053 - .063 not real impressed by the factory gapping, i wonder what the tolerance is? they are all supposed to be .060. Be SURE you check all of your plugs before you install them. dont do like it did and trust them. Now I have one engine with new NGKs supposedly pre-gapped at the factory installed and never checked. and 8 new ones with gapped allover the place. not putting NGK down they have alwys been pretty good to me in the past, but then again on ly really used tehm in dirt bikes and 4 wheelers.

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    Charter Member #5 MRBAJA's Avatar
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    Re: Spark plug #'s and what Engines they fit

    Quote Originally Posted by unclebrisket View Post
    I put about a $250 set of digital calipers on 4 of the NGK plugs I bought to put it the 30 yesterday. I had gaps ranging from .053 - .063 not real impressed by the factory gapping, i wonder what the tolerance is? they are all supposed to be .060. Be SURE you check all of your plugs before you install them. dont do like it did and trust them. Now I have one engine with new NGKs supposedly pre-gapped at the factory installed and never checked. and 8 new ones with gapped allover the place. not putting NGK down they have alwys been pretty good to me in the past, but then again on ly really used tehm in dirt bikes and 4 wheelers.
    Should be gapped at .60 I believe....
    DAVE -N- KELI
    "NAUTI ONE"
    SPRING, TX.

    "Keep on dreaming even if it breaks your heart"...

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