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  • 1 Post By rspears

Thread: What spark plugs
          
   
   

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  1. 05-21-2013 06:16 AM #1
    70chevybb
    70chevybb is offline CHR Member
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    What spark plugs

     



    I am just about ready to fire up my 468. I have 781 heads on it, what spark plugs would be good to use? I am running a mallory unilite dist and Mallory coil.
    Last edited by 70chevybb; 05-21-2013 at 06:23 AM.
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  3. 05-22-2013 06:17 AM #2
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    pat mccarthy
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    use what ever plug brand you like i use deso .auto lite . ngk . for heat the stock heat for the 73 454 should come up 5/8 short reach tapper seat . cross over would be like a champ rn8c or a ac 44
    Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
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  4. 05-22-2013 08:30 AM #3
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    rspears
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    Quote Originally Posted by pat mccarthy View Post
    use what ever plug brand you like i use deso .auto lite . ngk . for heat the stock heat for the 73 454 should come up 5/8 short reach tapper seat . cross over would be like a champ rn8c or a ac 44
    Pat,
    Can you help me understand what "...for heat the stock heat for the 73 454 should come up 5/8 short reach tapper seat" means? Also "deso"?
    Roger
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  5. 05-22-2013 09:25 AM #4
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    34_40
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    I'm thinking "deso" = "Denso" as in Nippondenso... Heat range to equal what the "books" show for the stock plug in a 1973 BBC 454.
    5/8 thread, short reach with a taper seat.
    Champ could be Champ brand or Champion brand plugs..

    I like an AC brand or Bosch in comparison.. but to each their own! LOL..
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  6. 05-22-2013 10:57 AM #5
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    Quote Originally Posted by 34_40 View Post
    I'm thinking "deso" = "Denso" as in Nippondenso... Heat range to equal what the "books" show for the stock plug in a 1973 BBC 454. 5/8 thread, short reach with a taper seat. Champ could be Champ brand or Champion brand plugs.. I like an AC brand or Bosch in comparison.. but to each their own! LOL..
    The "Denso" makes sense as you explain it. I'm familiar with "heat range" on plugs, but didn't see any reference to 1973 in the question, so the numbers didn't really make sense to me. "Champ" and "AC" were no issue, but "Tapper" thrown in was enough to put me in a tailspin . Thanks, Mike.
    Last edited by rspears; 05-22-2013 at 11:13 AM.
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    Roger
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  7. 05-22-2013 02:32 PM #6
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    781 head would be a short reach plug and would be a tapered seat and would be about a 1973 454 head he should of knew that they do just sell them under denso with on nip on them
    Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
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  8. 05-22-2013 02:38 PM #7
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    Quote Originally Posted by rspears View Post
    The "Denso" makes sense as you explain it. I'm familiar with "heat range" on plugs, but didn't see any reference to 1973 in the question, so the numbers didn't really make sense to me. "Champ" and "AC" were no issue, but "Tapper" thrown in was enough to put me in a tailspin . Thanks, Mike.
    well if you had a chevy it may 1973 was about the last year before they took the nuts off the 454 the 781 head s were a short reach taper plug
    and about that time frame so thats a good place to look in the book and should be a rn8c or a rts 44
    Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
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