I've got about 3500 miles on my new Goodwrench 350 and now I've got an oil fouled plug on the #3 cylinder (the other plugs are fine). Since I changed the oil last week I've used about a 1/3 of a quart of oil in only 223 miles. The car doesn't smoke although yesterday after sitting a few hours there was a small puff of blue smoke at start up. I can't imagine the valve seal is bad as it's a brand new motor. The Edelbrock Perfomer intake has oil stains around the middle of the gasket (see photo). I'm thinking maybe the intake gasket (Edelbrock) sucks (literally). The intake bolts are all tight. When the shop put the motor in they only sealed the threads on the four center bolts, so now after 6 months the second bolt on the driver's side is wicking oil when cold. The #1 plug is fine though it's just #3 that's fouled. I was on the Chevy Talk site and found this thread where this guy had what seems to be the same problem and he posted pictures of the leaking gasket after pulling the manifold. Am I on the right track? If the gasket is wet in that spot isn't it possible that it's sucking oil into the #3 cylinder? Any comments would be appreciated Thanks.

Chevy Talk link:
http://www.chevytalk.org/fusionbb/showtopic.php?tid/131251/post/932493/hl/oil+consumption/#932493

http://img201.imageshack.us/img201/2725/dscn0593aid3.jpg

http://img201.imageshack.us/img201/9899/plugqv2.jpg

Well, It's one of three things;
Bad rings/scored bore
Bad intake valve stem seal
Bad intake gasket

The first thing I'd check is the valve stem seal. Take off the valve cover and give it a good look. Then if it seems OK pull the manifold.
Wait a minute! You said a shop did the work! Get back there! They owe you. Or Goodwrench does.

How do you tell if your valve seals are any good by looking at them with the VC off?
What about exhaust valve? Could that also be his trouble?

The first thing I would do is check the compression on that cylinder to verify you don't have a mechanical problem. Broken ring or piston. Is their excess blowby? If that is not the case you need to determine if the intake gasket is leaking. Pulling the intake should let you know if the gasket is leaking. At that point you can look at the intake valve to see if you have a valve seal or guide problem. Or take it to the dealer if you don't wish to do the work.