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hei problems above 5000 rpm

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  • hei problems above 5000 rpm

    alright so i took my car to the race track yesterday. first time i've ran it. It ran a best of 12.97. @108. but somewhere between 4800 -5500 rpms it cuts out. i think it has more potential if i can shift @ a higher rpm. me and my buddy were talking and we both agree that it's probably the cheapo hei distributor. anyone else had similar issues? I have a msd 6a box i haven't installed yet and i plan on it. will this maybe cure the issue, or will i need a new distributor. any ideas.

  • #2
    Stock HEI's are very unpredictable above 5K. Is yours vacuum referenced or is it done through the ECM?

    A MSD box should help out alot.
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    Turbo Charged LS1/T56

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    • #3
      vacuum advance

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