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Thread: spark plug guide

  1. #1
    Senior Member MASTER BUILDER
    Join Date
    Oct 2003

    spark plug guide

    Ok I know this is a stupid question. Who has or how to go about getting the correct spark plugs for the application?
    I have a customers bbc corvette with a 502 BBC with ported world products heads. I have a set of plugs that came out of it but don't know if they are correct. I understand how toi determine heat range etc but is there not some deal with plug depth etc?
    Also am I supposed to use resostor plugs with resistor wires?

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Nov 2006
    NO resister plugs with resister wires!

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    May 2006
    We run the ngk's plugs in our 496 merlin headed bbc part # 5673 in the number 8 heat range.
    $!.99 per plug at napa auto parts.
    Goodluck, Charles
    ***IN GOD WE TRUST***

  4. #4
    Member CRAFTSMAN
    Join Date
    Feb 2006
    Bastrop,TxBy way of Alabama
    Is the NGK 5673 plug a .460 thread reach plug?And will this plug work in BBC990 heads.They have Autolite 133's in them now.Just trying to find the correct plug also.

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