Spark plugs Sp578? New part number for 542?

Discussion in 'Generation 4 - Performance Upgrades' started by SaveMelMac, Jun 7, 2019.

  1. SaveMelMac

    SaveMelMac SHO Member

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    just ordered some sp542 plugs but was sent sp578 Plugs instead. Anyone know if it’s a new part number or they just send me the wrong stuff?
     
  2. SaveMelMac

    SaveMelMac SHO Member

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    I think they just sent the wrong plug long number is CYFS-12Y-PT. But if anyone has any info please let me know.
     
  3. Lostneye

    Lostneye SHO Member

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    Following. The SP534s where updated to SP580 but I haven't heard anything about the 542s.
     
  4. SaveMelMac

    SaveMelMac SHO Member

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    Will update when the replacement ones show up. Bought the first set through amazon the replacements are coming from rockauto
     
  5. mybigsho

    mybigsho SHO Member

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    Yes the 542 is replaced with 578 and they increased the price a buck a plug..
     
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  6. mattr66

    mattr66 SHO Member

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    This sucks.... Not the same heat range or fine electrode like the 542....

    Sent from my Moto Z (2) using Tapatalk
     
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  7. MHW100

    MHW100 SHO Member Supporting Member

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    How does the stock 534 then stack up against the 578?
     
  8. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    SP542 (CYFS-092-YPT) has been superceded by SP578 (CYFS-12Y-PT).

    That being said, the SP542 plug is still readily available. Go to your local Ford Dealership and get them. I have 50 sitting in a drawer right in front of me as I type this.
     
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  9. mattr66

    mattr66 SHO Member

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    Buy them all for the love of everything holy.....LOL

    Sent from my Moto Z (2) using Tapatalk
     
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  10. SaveMelMac

    SaveMelMac SHO Member

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    Well rock auto still has the sp542’s they look identical expect the inner porcelain on the electrode is a smaller diameter
     
  11. mattr66

    mattr66 SHO Member

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    Def not same heat range as the 542 (on right)[​IMG]

    Sent from my Moto Z (2) using Tapatalk
     
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  12. Raging Bull

    Raging Bull SHO Member

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    Matt you should by them all so when I order your tune and plugs I know I can get them ! Lol.
     
  13. MHW100

    MHW100 SHO Member Supporting Member

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    Got 12 more coming which should be good for a few years
     
  14. Tim Teague

    Tim Teague New Member

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    I just bought a set of 542's from Rockauto and installed them Monday. I might have to go back and order another dozen after reading this.
     
  15. Majestic

    Majestic SHO Member

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    Just ordered a set from rockauto. Is .35 gap correct? That's what the order shows.
     
  16. Tim Teague

    Tim Teague New Member

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    Mine were listed and arrived at .29. They work great with my Unleashed 93 Performance tune.
     
  17. mattr66

    mattr66 SHO Member

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    On stock gen1 coils I recommend .026

    Sent from my Moto Z (2) using Tapatalk
     

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