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This does not sound very likely. Are you really sure that this is not one of the following problems (one of which is not a problem).
1. When I changed mine a few days ago, my RH exhaust pipe was smoking all over the place and there was quite a puddle in the garage. When the valve cover was off (and during the manual turning of the engine, which I did a lot of), quite a bit of oil had leaked backwards (my garage, like most, is designed to slope away from the house). At first, I thought that this was a valve cover leak. But it did eventually stop.
2. Unless your valve cover gaskets have been previously replaced (you did this), they are probably shrunken and hardened. I bought new ones for this project. The difference in feel is very significant. The old set (which leaked a little before removal as it was) certainly could not have been reinstalled with anything less than spectacular leaking. Note that I also bought the crush washers for the valve cover bolts. Shop around on these. The price differences between suppliers is amazing, and you should buy at least 8 (I bought 16) of them.
3. The valve covers are amazingly thin (I polished mine, and I swear half the thickness is the epoxy paint) and they do bend and distort. I would take the torque specs very seriously, and criss-cross slowly to get up to torque. 3 NM isn't very much, I used a 1/4" torque wrench and converted (I think this was around 25 in-lbs). Too much torque is very bad.
4. I know it's very hard to see towards the back of the covers (never mind the fun of installing them). Are you SURE that you didn't slip the gasket off in the back corner? I put a VERY SMALL amount of oil in the groove of the gasket to give a little vacuum grip to it.
5. You don't have anything pinched (like a wire or a chunk of something) between the head, gasket, and cover, do you?
6. The hose on the RH valve cover towards the back is tightened and in good shape? Connected to the air cleaner?
Doing the work I did was a great opportunity to clean my engine compartment, so any new leaks should be easy to spot.
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