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Spark plug gap for 75 GM, 250, 6 cyl.?

Discussion in 'The Garage' started by Eric M., May 1, 2005.

  1. Eric M.

    Eric M. 1/2 ton status

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    Anyone know the correct gap for the spark plugs in a 75 GM, 250 ci. 6 cylinder engine?

    The specs. found on the sticker under the hood are long gone. I'd pick up a Chiltons manual, but the trucks hardly worth the cost of the spark plugs already!

    Thanks,

    Eric M.
     
    Last edited: May 1, 2005
  2. diesel4me

    diesel4me 1 ton status Premium Member

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    thirty five thousandsths.....

    I believe all 6 cylinder chevy's plugs are gapped at .035--points or HEI....some 75 only GM vehicles used wide gap plugs set at .060 or .080 ,but only on V8's ,and they reduced the gap on them to .035-.045 in 1976 after a lot of complaints about hard starts in cold weather and the plugs getting wet and flooding too easy..those ac plugs that have extended gaps had the suffix TSX at the end of the number...I'm 99 % sure the inline 6 cylinder motors always used .035 as the gap setting on the plugs...... :crazy:
     
  3. Eric M.

    Eric M. 1/2 ton status

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    Thanks!

    Eric M.
     

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