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Spark Plug Help!

Discussion in '1936-Present Suburban' started by porboy, Jun 15, 2003.

  1. porboy

    porboy Registered Member

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    Sorry for the repeat post for those that read this in the "Garage" forum but I am in need of advice.I can't get a straight answer out of anyone I know as to what I should gap my plugs to. It is a 75 3/4 ton Suburban with a new 350 crate motor and HEI. I keep hearing .035 and .060. I have no idea which one to use. I know I could split the diffrence but I am heading on a 2000 mile road trip and want everything to spec. Please help.
     
  2. 01fatboy

    01fatboy Registered Member

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    standard gor HEI is 45 but you can open them up untill pinging and then back off a few but HEI is 45 /forums/images/graemlins/thumb.gif
     
  3. BurbinOR

    BurbinOR 3/4 ton status

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    Not sure what year rig you have (hint - fill out your profile a bit more) but my 91 V2500 gap is .035"
     
  4. mosesburb

    mosesburb For Rent Premium Member GMOTM Winner

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    Fatboy is right, .045 on a carbureted HEI. BurbinOR is right as well, .035 on an injected HEI.
     
  5. big pappa b

    big pappa b 3/4 ton status

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    go with the .045...it will run just fine.
     
  6. porboy

    porboy Registered Member

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    Thanks guys! Now, any sparkplug preference(model number)I should run? Profile has been updated by the way.
     
  7. mosesburb

    mosesburb For Rent Premium Member GMOTM Winner

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    Spec plugs are A/C R45TS. Lately I have been running the commercial version (which is CR45TS) plugs in carbureted applications. They last a bit longer, and I can tell a slight difference in seat-of-the-pants performance. The only bitch is that sometimes they can be a bit difficult to find.
     
  8. BurbinOR

    BurbinOR 3/4 ton status

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    Mine were the AC R43TS..............
     

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