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Message: <blockquote data-quote="Uluz2a6" data-source="post: 22517" data-attributes="member: 3941"><p>When the mechanic did the compression test, was the vehicle at full temperature? The head gasket(s) on a warped cylinder head may be able to provide some seal at lower temp. This engine is known for needing cylinder heads machined straight again and new gaskets. Also is the cooling system full of coolant or just water? Makes block test difficult if mostly water, specially if issue occurs only at full temp</p></blockquote><p></p>