Greg asked if a head gasket could blow and not give any indication in the
cooling system. It certainly can! There are many places where the gasket
can leak and not involve coolant (for example, directly between the
cylinders). I have even seen major cracks in combustion chambers that
leaked compression but not water. In fact, there is about a 20 pct. chance
of that happening. That's why I strongly recommend a leakdown test. A
compression test only tests the ability of your engine to pump air and
hold it for a short time. A leak down test is a positive test, and almost
always finds the problem.
Marcus A. Pryor
For a new age of reason
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