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its a spark plug gasket, and its installe dinto the VC, and usually repalced when you replace teh valve cover gasket. If i was you i woudl replce the VC gaske, the spark plug gaskets(all four) then replce the plugs.
You ownt need to remove the cyliunder head to chaneg that, jsut the valve cover. But when you do so make sure you have some silicon to put down after you replce the gasket berfore you install the VC.
That little buit of silicon goes over the hums where the cams are so as to help ensure tight seal. This is an easy job as long as you have teh new gaskets and the tools and a ltitle bit of know how.
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