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Block/head mating surface. Gasket isn't blown since you just put a new one in but the head may be warped or the head may not be uniformly on. The problem with using a different sized bolt, or timeserts/heli-coils is if you torque it to factory spec, it may be off a bit due to being a different setup than from the factory.
Just one reason I don't like aluminum engines; that wouldn't have been a problem at all on a cast iron engine.
Compression is probably good because the coolant that ends up making its way into the cylinder(s) is helping raise compression a bit and masking it.
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