Head gaskets don't just leak into the water jacket. It could be losing compression into the exhaust manifold. You also might have burned exhaust valves or broken valve springs causing low compression.
Thanks!! I`m pricing leak down testers and their quality. Renting too. Would my spark plugs give me a clue?
If they were fouled maybe. They may show signs of burning oil, or corrosion from water or antifreeze.
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