1966 ford thunderbird 390 spark plugs | Ford Thunderbird forum club group 1955-2005 models

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1966 ford thunderbird 390 spark plugs

  1. cwink5

    1966 Exhaust Manifold? Cracked Oil Leak Gasket

    My knowledge is very minimum so trying to figure out what I’m looking even looking at and how bad & what I need to do order and do to fix. Rust & Gasket disappearing, oil around some of the plugs and plugs had oil and smelled like gas. Large crack on the passenger side rear I noted in the...
    • cwink5
    • Thread
    • 1966 ford thunderbird 390 spark plugs cracked exhaust exhaust manifold exhaust manifold gasket revision gasket oil leak rust repair
    • Replies: 14
    • Forum: 1955 - 1966 Classic Ford Thunderbird
  2. M

    1966 Spark plug issue

    Howdy Gang, I bought some spark plugs for my 66 thunderbird. 390 4 barrel. The spark plugs they gave me were "correct" for the 390 engine but they were smaller than the ones in the block. The ones I bought fit a 5/8 socket(motorcraft plugs) The engine plugs fit a 13/16 socket. I'm guessing she...
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