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I can't dig up the link I saved, but on my Accord, there are two sets of o-rings that keep the oil out of the spark plug tube. One set comes with the valve cover gasket set, which sounds like the ones you replaced. The others are further in the head and require removing parts (rocker arms?) I would assume that the Civic uses a similar design.
Thanks for reminding me--I'm having my timing belt done in about 3,500 miles and I'll make sure they replace those as well.
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