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Thread: 558312 Ground To Cylinder Head

  1. Default 558312 Ground To Cylinder Head

    I was discussing this with a friend yesterday, and we both got to questioning the ground to cylinder head for each bank of coils, and how it's suggests this wire be short as possible and grounded to each cylinder head that the coils are running on. Question is what about aluminum heads? Is this still the proper procedure or? I was under the impression aluminum is not a good conductor/ground.

  2. #2
    Join Date
    Dec 2009


    It's fine, the spark plugs self ground to the aluminum cylinder heads!
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  3. Default

    Good to know that little bit of info. Thanks!

  4. #4


    Aluminum is a far better conductor than is cast iron. The only caveat with either material is getting a clean surface and one that will not corrode. In AC power wiring, you use a corrosive preventive grease for aluminum conductors at the connections. Frankly, I think people make too much of this. With 16 or however many head bolts, there is almost zero chance the heads won't be interconnected, and of course, the intake adds whatever amount of conductivity between them.

    On another note, I've had people claim that painted heads cause the plugs to "not ground." This is nonsense, as plug "juice" is very high impedance/high voltage and low current. "A few Ohms" of resistance between the plug shells and the heads won't ever be noticed.

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