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I believe that the gap is suppost to be .050", but don't quote me. It's either that or .045". I just replaced mine with OEM AC Delco plugs that were actually NGK's. As far as where they are, they are under the coil packs on each valve cover. Just remove the 6 or so bolts and that hold the module down, and remove it exposing the boots and plugs. By the way, the dealers recomend platinum plugs, if that is essential or not. And be sure to shop around, they are expensive.
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