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I have a 78 f100 with a 351, it was sucking through the exhaust and coolant was disappearing, so I pulled the head today. Clean them up and water tested the intake and exhaust on both heads. Why does each head have one exhaust chamber that would allow the water to flow from the exhaust out the intake chambers but on the same cylinder if I poured it in the intake chamber it would stay. Also, should I get the valve guide replaced if water from the chamber drip through it?