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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Spark Plugs

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    10/31/2021 3:26 PM  #1

    RV6
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    From: Pine Junction, CO
    Registered: 3/01/2016
    Posts: 1,248

    Spark Plugs

    Hey guys,

    What are you running for spark plugs in your 14mm aluminum heads? My 289 sports some old Edelbrock perfomer RPM 6025 heads installed back in the mid 90's. They have 14mm by .75" reach holes. Currently the holes are occupied by Autolite 3924 copper core sparkleizers.

    11:1 compression
    Point ignition
    Drip Pot

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
     

    10/31/2021 3:35 PM  #2

    Bolted to Floor
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    From: Houston, Texas
    Registered: 4/01/2013
    Posts: 2,016

    Re: Spark Plugs

    I like the autolites. That’s the same number recommended for mine. I opted for the platinum tip. Rockauto had the best price.

    John  -- 67 Mustang Coupe 390 5 speed
     

    10/31/2021 3:50 PM  #3

    Raymond_B
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    From: Fort Worth, TX
    Registered: 4/01/2013
    Posts: 1,204

    Re: Spark Plugs

    I am a big fan of good ole' copper plugs I'd keep what you have. 

     

    10/31/2021 8:38 PM  #4

    rpm
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    From: Bakersfield, Ca
    Registered: 9/17/2013
    Posts: 3,654

    Re: Spark Plugs

    AFR recommends Champion RC9YC copper plugs, which I have. But I don't know much about plugs, or anything else for that matter.

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    10/31/2021 9:26 PM  #5

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,974

    Re: Spark Plugs

    A local off shore engine builder recommended I use ordinary NGK plugs in my 331, so I replaced the platinum tipped one’s.
    NGK- FR5

    Last edited by Rudi (11/01/2021 10:43 AM)

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    10/31/2021 9:33 PM  #6

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,498

    Re: Spark Plugs

    Bearing Bob wrote:

    AFR recommends Champion RC9YC copper plugs, which I have. But I don't know much about plugs, or anything else for that matter.

    So does Edelbrock.  A regular copper plug doesn't last as long as platinum, etc., but provides the best spark.  The more expensive plugs simply last longer.  Platinum plugs came out when OEMs wanted to claim 100k before a tune up was needed. 
     

     

    11/01/2021 10:18 AM  #7

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,644

    Re: Spark Plugs

    Champion RC12YC, recommedned by Edelbrock. 
    Edelbrock 60329 "Performer" heads.
    ​MSD 8584 distributor, MSD recommeded gap 0.050-0.060", gapped at 0.055".

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    11/01/2021 11:20 AM  #8

    Nos681
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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,332

    Re: Spark Plugs

    Although I don’t have aluminum heads, I like using NGK V-Power.  The Auto Lites and Champion plugs are using steel that loves to corrode.  You can hear them rusting on a quiet night.

     

    11/01/2021 3:37 PM  #9

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,498

    Re: Spark Plugs

    BobE wrote:

    Champion RC12YC, recommedned by Edelbrock. 
    Edelbrock 60329 "Performer" heads.
    ​MSD 8584 distributor, MSD recommeded gap 0.050-0.060", gapped at 0.055".

    Yep, I misremembered that.  I knew it was a Champion plug with "RC" and "YC" in the number.  They are 12, not 9.  My Edelbrock 6073s on my 383 Chevy use the same plugs. 
     

     

    11/01/2021 4:03 PM  #10

    rpm
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    From: Bakersfield, Ca
    Registered: 9/17/2013
    Posts: 3,654

    Re: Spark Plugs

    He said the C word.

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    11/01/2021 4:23 PM  #11

    RV6
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    From: Pine Junction, CO
    Registered: 3/01/2016
    Posts: 1,248

    Re: Spark Plugs

    I'll stick with my Autolites. The be inexpensive and have worked well so far.

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
       •Thread Starter
     

     

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