It is a V6, but I can really see any evidence in the spark plug tube that the gasket might be leaking (in fact, it looks like the tube is all one piece to me, so its tough to see any gasket at all).

As far as gap, its supposed to be 1.1mm, and using a feeler guage I can estimate that its set perfectly (I didnt have a 1.1mm feeler, so I put a .530 and a .489 together).

Im going to re-install the plugs today with some dielectric grease. Maybe tomorrow Ill check the back ones
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-Chris