Spark plugs recommended for aluminum Stage 2 street eliminators

Discussion in 'Street/strip 400/430/455' started by collector, Oct 14, 2020.

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  1. collector

    collector collector

    What is recommended? Have a customer wanting to change the plugs on his car and wants to explore options..A/C, Champion, etc. Can't remember what I used to use on these engines!
     
    collector, Oct 14, 2020
    #1
  2. TrunkMonkey

    TrunkMonkey Totally bananas

    NGK FR5 V power is what I run in my BBB with TA Stage Ii SE heads.
     
    TrunkMonkey, Oct 14, 2020
    #2
  3. 455stude

    455stude Well-Known Member

    Running ngk power 8's. 12.36 to 1 compression with stg 2 se's.
     
    455stude, Oct 14, 2020
    #3
  4. hugger

    hugger Well-Known Member

    Ngk,...just please use a gasket seat plug,..if i see one more aluminum head with a taper seat plug in it im gonna go mental
     
    hugger, Oct 14, 2020
    #4
    Max Damage and TrunkMonkey like this.
  5. collector

    collector collector

    Yeh, I know about this! Gotta use gasket plugs. Anyone using a Champion plug? If so, part number?
     
    collector, Oct 15, 2020
    #5
  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Another vote for NGK FR-5. It is a projected nose plug, which positions the gap deeper into the chamber, and in theory, has a wider heat range. The heat range approximates an R43TS plug. NGK plugs have plated threads, which is a big plus in aluminum heads, no anti seize necessary.

    https://www.rockauto.com/en/parts/ngk,7373,spark+plug,7212

    The champion plug is more expensive,

    https://shop.advanceautoparts.com/p/champion-copper-plus-single-card-rc12yc-71-1/10060462-P

    https://www.sparkplug-crossreference.com/convert/NGK_PN/FR5
     
    Last edited: Oct 15, 2020
    LARRY70GS, Oct 15, 2020
    #6
  7. BQUICK

    BQUICK Gold Level Contributor

    AC R42XLS
     
    BQUICK, Oct 15, 2020
    #7
  8. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    LARRY70GS, Oct 15, 2020
    #8
  9. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    :DYou actually see that a lot? Wow.
     
    LARRY70GS, Oct 15, 2020
    #9
  10. hugger

    hugger Well-Known Member

    tenor (6).gif
     
    hugger, Oct 15, 2020
    #10
  11. 70 GMuscle

    70 GMuscle Plan B

    5 is a hot plug. I’d look at -7s.
    For racing even -8s.
     
    70 GMuscle, Oct 15, 2020
    #11
  12. Bens99gtp

    Bens99gtp Well-Known Member

    I use the NGK 7173 in mine, I like the smaller 5/8 size
     
    Bens99gtp, Oct 15, 2020
    #12
  13. Bens99gtp

    Bens99gtp Well-Known Member

    Bens99gtp, Oct 15, 2020
    #13
  14. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    No, it's about a 43 heat range in AC Delco. That's colder than the stock plug.
     
    Last edited: Oct 15, 2020
    LARRY70GS, Oct 15, 2020
    #14
  15. collector

    collector collector

    Thanks for the help, guys...I will pass this info on. This is a street car, about 10-1 and never gonna see a dragstrip likely.
     
    collector, Oct 15, 2020
    #15
  16. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    FR-5 for sure then. Ask Jim Weise what he uses in most of his engine.
     
    LARRY70GS, Oct 15, 2020
    #16
  17. dentboy

    dentboy stacy kelevra

    I recommend a ngk, heat range is based on COMPRESSION. Anyone recommending a plug without asking that question is just throwing suggestions out there. Everybody's motor is probably different, ask a real engine person a hotter plug will detonate faster than a colder plug
     
    dentboy, Oct 27, 2020
    #17
  18. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    The ideal plug is the coldest plug that doesn't foul.
     
    LARRY70GS, Oct 28, 2020
    #18
  19. agetnt9

    agetnt9 Agetnt9 (Dan)

    Yep , cold as you can go...
     
    agetnt9, Oct 28, 2020
    #19
  20. Jim Weise

    Jim Weise EFI/DIS 482

    Use the FR-5 NGK stock number 7373 for NA applications up to 11-1 compression.

    Use the NGK R5672-8 , stock number 7173 for engines above 11-1, or all boosted/nitrous applications.

    JW
     
    Jim Weise, Oct 28, 2020
    #20
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