Two words - Compression Test. But I think you may already know. Kinda gave it away with the wet plug and coolant in the exhaust part.
Originally Posted by aww618
The engine was just put together by a garage just 10,000 miles ago. I watched the guy inspect the heads for warping and blended the head to make sure it was flat.
This part I have issue with. What do you mean "blend". Although a good mechanic can tell if it is warped you do not "blend" a head surface. If it is warped it needs to be machined at a proper shop to be made "true" again.
If this "garage" did what your statement implies you need to make no contact and avoid them like the plague.
Oh, if everything checks ok, change that plug and the oil asap.
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