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Thread: what kind of spark plugs is everone using

  1. #1
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    what kind of spark plugs is everone using

    I have a 383 with 400hp and when i asked what kind of plug to buy the engine builder said that its a gm and they like champion plugs.i asked is there ones that are better.so my Q is what is everbody running.there is such a wide range off plugs out there and do they make a difference.thanks craig.

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    MR43T in my 383, tried NGK one season which I condider a very good quality plug but they came out quite a bit dirtier that the 43's. Denso is another great plug, IMO plugs are simlar to props some work better in different applications. On any of our rigs a good hot coil is a must!

    Phil
    No matter what your beliefs are "GOD BLESS AMERICA"

    Fully retired marine tech near 60 years in the biz.

  3. #3
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    I bought my 22 in 2006 and haven't even looked at the plugs. I know they are at least 6 years old.

    When I finally changed the plugs in my Minx, I used NGK's.

    Ken

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    autolite
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    I saw a post somewhere over on oso and there was someone that actually dyno'd different plugs and NGK was the only one that made any more power than the rest. Don't fall for any of those crazy 4 arm and such plugs.

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    NGK ... Can't get AC or Autolite out here .
    Wouldn't run Champions in a lawnmower..
    Just because something's old doesn't mean you throw it away !

  7. #7
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    I always had good luck with Champions, but that was in the 70s and 80s. The original 43s in my brothers 1997 Sea Ray look as good as new. 43s or NGKs.
    Cheers,
    Pismo
    1996 22 Classic
    Red with Stainless Windshield
    Stock Gen VI 502 Magnum MPI-415hp
    Stock Bravo I
    25" Mirage Plus
    74.5mph best @ 5050rpm GPS (Speedo said 80)
    27" Labbed Mirage Plus
    75.5mph best @ 4800rpm GPS (Speedo said 82)

  8. #8
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    if you know how to read spark plugs, buy the Denso's

    if you don't, then it really doesn't matter what ya buy
    Charter Member - WAFNC, SBBR, KWOSG
    1955 Perfect Mate
    1986 Hornet III, 502-415 TRS

    www.donzi.org


  9. #9
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    I've always had good luck with Denso's in any performance application.

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    Normally I'd say if they're the right heat range and the engine is tuned reasonably well it won't make much difference what brand you run.

    Back in the day when I was racing my Alfa I ran NGKs because the local shop was good at ordering exactly what I wanted. Most other people tried to tell me to run Bosch platinums (this was before there were all the current 'super deluxe double uranium plugs on the market) but I referred to them as the 'self fouling plug'. Then again, that car wasn't exactly stock and I might have set up the old L-jet injection all that well either.

    Just last weekend I changed the (original) champion plugs on my 70K mile '05 dodge hemi to a set of Autolight platinums. Kinda runs like chit now; likes to stall in gear. Talked to a couple of Mopar techs on another forum and they all agreed - Ma Mopar don't like no autolights. So this weekend I'm putting another 16 base copper Champions back in it. Surprised me that a late model, basically stock engine would have that much difference between plugs but there it is.

    Normally I'm an NGK fan fwiw - they're my 'go to' plug on most things.
    Don
    '01 22 Classic, 502/B1
    And a bunch of other stuff

    "If everything seems under control, you're just not going fast enough" - Mario Andretti

  11. #11
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    get the Mopar plugs from Mopar, you'll understand why if you don't...
    Charter Member - WAFNC, SBBR, KWOSG
    1955 Perfect Mate
    1986 Hornet III, 502-415 TRS

    www.donzi.org


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    NGK R5671A-8's in my Whippled 383.
    2006 CLASSIC 18 WHIPPLED MX 6.2, BRAVO 1, STAINLESS MARINE EXHAUST, LATHAM STEERING, IMCO 2" SHORTY, LABBED MIRAGE PLUS

    TALK IS CHEAP, I'M FROM THE "SHOW ME STATE" SHOW ME

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    I was worried when i put this out there that this might have gone the way the oil debate goes but this is great.Now it looks like NGK are the way to go for the 383 but it is interesting how some engines like what they came with like the dodge.i also have a dodge and had the same problem,had to change them back to the origianl from dodge to pass the E test that we have to do here in ONTARIO.i have the basic champions in there now so if i change to NGK could i see any difference in performance or will it lust run better.it runs great now just whant the best that it can be at 82mlp.any little bit will help

  14. #14
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    Just for fun I ran some Denso Irridium plugs in the Minx. They performed very well. I was able to get the correct plugs on eBay for about $10.00/each. I think that was a good price and some good plugs.

    By the way, does anyone here know the original application for Bosch's platinum plugs? (Bosch did invent them, back in the early '70's). I'm talking about a particular car and engine combination and for a particular activity.

    .
    George Carter
    Central Florida
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    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

  15. #15
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    Back in the late 70's and through the 80's I had a (German) car that if you ran anything else , no matter how exactly cross matched , you could tell the difference if it wasn't Bosch plugs. I'd have never believed it if I hadn't seen it myself , so I can relate to the Mopar reference above.
    Just because something's old doesn't mean you throw it away !

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