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spark plug gap/torque

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by lasvegas, Dec 28, 2001.

  1. lasvegas

    lasvegas 1/2 ton status

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    zz4 crate motor with aluminum angle plug head. Does anyone know the right gap for the plug (I used .044") and the correct torque for the plug (I would guess torque would be 10 t0 15 lbs.)
     
  2. 95 Silverado

    95 Silverado 1/2 ton status

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    the plug gap would actually depend on the ignition system you are using, follow the manufacturers spec, .044 is a good general setting for hei or most electronic systems, 15 lbs. sounds right for the torque as well, but they recommend using anti-seize on the threads with aluminum heads.

    '95 Chevy Silverado 1500
    5.7 V8-NV4500- 3.73 rears
    See My Toys: <a target="_blank" href=http://community.webshots.com/user/wdb172454>http://community.webshots.com/user/wdb172454</a>
     
  3. HarryH3

    HarryH3 1 ton status Author

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    The '87 Corvette factory service manual lists the spark plug torque spec at 22 lb. ft. Those engines had the L98 aluminum heads. And indeed, you do want to put some anti-seize on the threads. The disimilar metals tend to corrode themselves together. You don't want to EVER strip out the spark plug threads! [​IMG] I put anti-sieze on every bolt that threads into the aluminum heads, just to be safe. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  4. TX Mudder

    TX Mudder 1/2 ton status

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    My book says 25 ft lbs. for iron heads, so that 22 listed for the vette sounds right.

    Gap depends on what you're running. Stock HEI will oviosuly be less than an aftermarket box.
    -- Mike

    <font color=blue> Married to a woman who understands the need for <font color=orange>Hugger Orange. [​IMG] <font color=blue>
     

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