604 crate spark plugs

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  • Hagen14t
    Senior Member
    • May 2011
    • 167
    #1

    604 crate spark plugs

    Hey guys I have a quick question about spark plugs for the 604 crate. When the motor comes, it comes with AC Delco plugs in it. Are these good plugs to run? Are they already indexed? If not what type of plug would be best?
    Tags: None
    • brad hibbard
      Senior Member
      • Oct 2007
      • 974
      #2
      we use NGK R5724-8

      the AC's work fine as well

      we have never found a gain with indexing

      Brad
      Race-1 | Circle Track Racing Engines & Performance Parts
      https://www.race-1.com
      Race-1 offers competitive pricing on Chevrolet Performance 602, 604 & 525 sealed circle track racing engines. Race-1 specializes in the GM CTC engines and we offer a wide variety of services specific to the 602 & 604 crate engines. Your source for Stealth Racing Carburetors! Learn from Brad's expertise in teaching, too!

        Comment

        • Matt49
          Senior Member
          • Jun 2007
          • 3123
          #3
          Originally posted by brad hibbard View Post
          we use NGK R5724-8

          the AC's work fine as well

          we have never found a gain with indexing

          Brad
          www.race-1.com
          Given that indexing takes time, something that none of us have enough of, are you saying we simply don't need to be going through the trouble?
          What do you think it is about these motors that doesn't lend itself to an advantage through indexing?

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