head gasket, intake manifold gasket; are they in close proximity to each other? which one sits on the block ? can both fail simultaneously?
The head gasket is between the head and the block. The intake manifold gasket is in between the head and the intake manifold. You apparently have a leak between a coolant passage and a combustion chamber. If the intake has a coolant passage it could leak into the manifold and then run into the engine.
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