GM "Update" for Your 4-pin HEI distributor

Discussion in 'Tips 'n' Tricks Topic' started by sandlapper, Mar 14, 2021.

  1. sandlapper

    sandlapper Veteran Member

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    We all know the GM 4-pin HEI (mid-seventies thru early-eighties and universal performance favorite). We also know it's near dead-nutz reliable; but that their modules occasionally fail and that's often attributed to it becoming overheated. Of course we also know to ensure the module is installed with a good heat transfer/thermal paste (such as Arctic Silver) between it and its mount pad on distributor base. We know how heat is mortal enemy of most electronic circuits; and that reducing heat can often extend electronics' useful life. Well ...

    Years ago, GM removed the module from inside-on that very hot distributor housing and mounted it (and coil) remotely.

    You can easily relocate Your old module as well... where it'll run much cooler.
    Ignition Control Module Heat Sink GM pn 10474610 (trucks 94-2004) < $12 @ RA
    https://www.rockauto.com/en/parts/acdelco,10474610,ignition+control+module+heat+sink,11323

    drill new holes in new heat sink to fit Your 4-pin module, bracket it atop motor or on firewall etc, extend-sleeve your pickup & coil wires, mount Your module to new heat sink w/ thermal paste.



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    Last edited: Mar 14, 2021
    danbrennan, mrluckies, RS1979 and 2 others like this.
  2. biker

    biker Veteran Member

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    Thanks for this! Definitely will do the mod when car is out of storage jail. Soon I hope.
     
  3. Fbird

    Fbird Veteran Member Lifetime Gold Member

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    do NOTE the difference between THERMAL paste and Dielectric grease!!!! NOT the same.
     
  4. John Wright

    John Wright Veteran Member Lifetime Gold Member

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    Another module killer is a dead spark plug or one with a spark plug wire that is arcing to ground.
     
  5. cadillac_al

    cadillac_al Veteran Member

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    Funny thing is, I have never bought a module that didn't come with dialectic grease. I wonder why the manufacturer doesn't give us thermal paste?
     

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