Quote:
Originally Posted by weeeee
Go to a shop and have them do a compression leakdown test.
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A "compression leakdown test" is actually two different tests. A compression test determines the cylinder's overall compression by spinning the engine over and measuring the pressure produced. A leakdown test is where you introduce air into the cylinder and determine how much of that air is leaking from the combustion chamber (and where the hell it's going). Neither is gold standard for detecting a blown head gasket.
A block tester is the most common method of checking for exhaust gas inside the cooling system, which could mean many things. Blown head gasket, cracked head, cracked engine block, etc.