Location of Head Gasket on 1994 Grand Marquis?

The head gasket is always the gasket between the head (cylinder) and the main block of the motor.
The head gasket (in your case gaskets) is located on the top of the engine block under the engine cylinder head which is under the Camshaft cover which is the very top of the engine. This car is a V8 engine so it has 2 heads and 2 head gaskets, one on each side of the engine. It is a very expensive job to replace head gaskets.
This requires a lot of labor to replace. The intake must be removed, then the cylinder head itself. This is a major repair if the head gasket needs to be replaced.

This details will help.Thanks.

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