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^^^
Exactly - have the head studs inspected and ask the owner about the engine's oil consumption rate (only way to judge valve guides - compression and leakdown numbers won't indicate guide problems unless the wear is so bad that the valve doesn't seat correctly . . . not to mention that neither test is going to tell you much about the studs if the engine has not been run hard and up to temperature prior to the tests), before throwing in the towel.
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