**edited again. too long before and too angry. my car got broken into and trashed as it sat on the side of the road till monday morning when i could get it to a mechanic. real bad day.**
**update**
i spoke to the manager at the dealership that replaced my short block (Gold Rush Subaru Auburn, CA) and they will not consider talking resposibility for the problem. they told me that they did not replace the spark plugs and that they never touched the plugs at all. I asked if they removed the wires attched to the plugs and they said yes- but that when they sent the heads off to a machine shop to check if they were warped/cracked they never tightened or lossen any of the plugs. The dealership i'm talking the car to now tells me that the other 3 spark plugs were loose too.
**update**
If a Subaru dealership breaks down an engine, sends the heads to a machine shop to check if they are warped, determines that they are not, and installs a new short block with the old heads, would they have taken out the spark plugs at some point? Is it reasonable to expect them to have checked that the plugs were installed correctly?
Less than 10 months ago, i had new engine installed at a subaru dealership. While driving 3 days ago a sparkplug blew out of the left front cylinder head- stripping the threading in the head.
The replaced engine is still under warranty so I took the car to the nearest Subaru dealership (not the dealer that installed the engine) to fix the problem. The two dealerships have discussed the issue and won't repair the head because the first dealer did not replace the cylinder heads (or the spark plugs?) when they did the work.
I was told that the spark plug blew out of the cylinder head because it was not screwed in correctly (too loose/tight?). All feedback is greatly appreciated.