Headers off -- changing Spark Plugs -- what type are best?

Discussion in '1994 - 1995 Specific Tech' started by DJHA90, Aug 17, 2003.


  1. DJHA90

    DJHA90 Member

    Joined:
    Dec 18, 2002
    Messages:
    581
    Likes Received:
    0
    Trophy Points:
    16
    Any recomedations on spark plugs? Figured wile I had the headers off, might as well do the plugs too.
    #1
  2. FastmanGT

    FastmanGT Founding Member

    Joined:
    May 22, 2002
    Messages:
    588
    Likes Received:
    0
    Trophy Points:
    0
    The stock heat range copper plugs will do you just fine, like the Autolite 3925, or the stock Bosch replacements from Pepboys or Autozone will do you good too.
    #2
  3. VibrantRedGT

    VibrantRedGT "STANGNET'S PENGUIN SMACKER" Super Mod

    Joined:
    Nov 30, 1999
    Messages:
    15,552
    Likes Received:
    220
    Trophy Points:
    114
    Iron heads=Autolite 25's.
    #3
  4. RIO5.0

    RIO5.0 Mustang Master

    Joined:
    Feb 17, 2001
    Messages:
    6,873
    Likes Received:
    3
    Trophy Points:
    88
    If you wanna try something different...NGK UR45 V Groove... :nice:

    I run these with no problems...i swap between the stock ones and these. With my recent head install, I switched back over to the NGK's...
    #4
  5. Sup95Cobra

    Sup95Cobra New Member

    Joined:
    Nov 10, 2002
    Messages:
    174
    Likes Received:
    0
    Trophy Points:
    0
    The Denso are a great plug also!
    #5
  6. Merkstang

    Merkstang Founding Member

    Joined:
    Jan 3, 2002
    Messages:
    388
    Showcase:
    9
    Albums:
    1
    Likes Received:
    0
    Trophy Points:
    16
    Ive got the NGK's Works great!!
    #6
  7. 94Fauxbra

    94Fauxbra New Member

    Joined:
    Feb 24, 2003
    Messages:
    511
    Likes Received:
    0
    Trophy Points:
    0
    im running NGK's. Im new to the whole "Aluminum Head Craze"....is there a certain plug you should run with aluminum heads???
    #7
  8. VibrantRedGT

    VibrantRedGT "STANGNET'S PENGUIN SMACKER" Super Mod

    Joined:
    Nov 30, 1999
    Messages:
    15,552
    Likes Received:
    220
    Trophy Points:
    114
    Autolite 3924's. Gap them at .045.
    #8
  9. 94Fauxbra

    94Fauxbra New Member

    Joined:
    Feb 24, 2003
    Messages:
    511
    Likes Received:
    0
    Trophy Points:
    0
    Vibe...is there any reasoning behind running the Autolites or is it just the thing to do?
    #9
  10. VibrantRedGT

    VibrantRedGT "STANGNET'S PENGUIN SMACKER" Super Mod

    Joined:
    Nov 30, 1999
    Messages:
    15,552
    Likes Received:
    220
    Trophy Points:
    114
    Nah, you can run NGK's UR series as well. Autolites are plentiful though and I know the part numbering system pretty well. Stay away from Platinum plugs. Never a fan of those.
    #10
  11. 1fstgt

    1fstgt New Member

    Joined:
    May 28, 2003
    Messages:
    728
    Likes Received:
    0
    Trophy Points:
    0
    man i've had nothing but trouble with autolites. i always just use motorcraft plugs because i can get them pretty cheap.
    #11
  12. Rootus

    Rootus Officially Addicted

    Joined:
    Feb 8, 2003
    Messages:
    6,747
    Likes Received:
    0
    Trophy Points:
    0
    I believe Motorcraft & Autolite are actually the same plug.

    I use Autolite 3924's with my AFR's, gapped at 0.054. When I still had the E7's, I used Autolite 24's, again gapped at 0.054.

    Dave
    #12
  13. VibrantRedGT

    VibrantRedGT "STANGNET'S PENGUIN SMACKER" Super Mod

    Joined:
    Nov 30, 1999
    Messages:
    15,552
    Likes Received:
    220
    Trophy Points:
    114
    Think you've just :owned: yourself.
    #13
  14. 1fstgt

    1fstgt New Member

    Joined:
    May 28, 2003
    Messages:
    728
    Likes Received:
    0
    Trophy Points:
    0
    that's weird because we get car's in all the time at our shop with a misfire and just had the plugs changed at some private shop and the plugs would be autolite's or some other plug and they would already be bad and then we'll change the plugs with motorcraft ones and it'll be gone. :shrug: but you could be right. i'm just saying that we have lots of trouble with aftermarket plugs and especially the autolites. well champions are the worst but that's a whole 'nother story.
    #14
  15. 94GTLaserRC

    94GTLaserRC Squint as you approach, lest you be blinded by my

    Joined:
    May 7, 2002
    Messages:
    11,187
    Likes Received:
    7
    Trophy Points:
    79
    Joe: Im gonna go ahead and get new plugs for when we put the Romac In, since they didnt change them with the blower. Which ones should I get for My application? If they are ones we have at Walmart, Ill get them there. If not, Ill have to get them where you say is the best place.

    I figured I may as well do them while I got the car there doing the Romac. Once that balancer is done, and I get the right plugs/gap in there, Ill get the 4:1 FMU and the Tune, and hopefully I should be all set (for now, anyway)
    RC
    #15
  16. AznStanger3v

    AznStanger3v Active Member

    Joined:
    Aug 11, 2003
    Messages:
    2,033
    Likes Received:
    0
    Trophy Points:
    47
    if you are gonna change your plugs, minds well go for iridium core ones. denso or ngk work nicely. im running NGK and they are great.
    #16
  17. Rootus

    Rootus Officially Addicted

    Joined:
    Feb 8, 2003
    Messages:
    6,747
    Likes Received:
    0
    Trophy Points:
    0
    That sounds like a good idea, except that the Iridium plugs are like $14 *each*. I can put in a set of Autolite 24's or 3924's for about $14 *total*. :D

    Dave
    #17
  18. Sup95Cobra

    Sup95Cobra New Member

    Joined:
    Nov 10, 2002
    Messages:
    174
    Likes Received:
    0
    Trophy Points:
    0
    I have you set up pretty much and I use autolite plugs gapped at .032 because of the blower do not gap them at the factory settings of .054.
    #18
  19. 94GTLaserRC

    94GTLaserRC Squint as you approach, lest you be blinded by my

    Joined:
    May 7, 2002
    Messages:
    11,187
    Likes Received:
    7
    Trophy Points:
    79

    That would be Autolite 3924?
    Thanks
    RC
    #19
  20. FastmanGT

    FastmanGT Founding Member

    Joined:
    May 22, 2002
    Messages:
    588
    Likes Received:
    0
    Trophy Points:
    0
    General rule for plugs, Stock range is for iron heads and no power adder - Autolite 3925, One range colder would be for either aluminum heads or a power adder, not both - Autolite 3924, and Two ranges colder for both aluminum heads and a power adder - Autolite 3923. Gapping for power adders is as said smaller than stock to help prevent spark blow out.
    #20

Share This Page