That is a common problem with the Vortec engines, First place the gasket is not made of much as you can see.
Antifreeze eats the gasket up over time. The ORANGE antifreeze is BAD.
If the Intake was OVER TORQUED that will cause it to leak/ Go bad too.
Intake manifold gasket
Yes.
Yes, you must install a new intake manifold gasket.
The intake gasket is the gasket that conncects from your air filter into your intake manifold
To replace the Suburban manifold gaskets, unhook everything on the manifold, from fuel lines to vacuum hoses. The manifold needs to be unbolted then removed. Clean the old gasket material, then install with a new gasket. Make sure to use factory specs when torqueing down the bolts.
Between the intake manifold and the cylinder head.
between the head and intake manifold
Assuming this is a 4.3L engine, the upper intake manifold gasket would be between the upper intake manifold and the lower intake manifold.
jaguar 2001 Lower Engine Intake Manifold Gasket
Remove the intake manifold retaining bolts from your 1996 Chevy Astro Van. Remove the manifold gasket and clean the surface. Reverse the process to install the new intake manifold gasket.
Remove the intake manifold retaining bolts from your 1993 Mercedes-Benz manifold. Remove the old manifold gasket. Clean the surface and put the new gasket on.
The only fix for a bad intake gasket is to remove the intake manifold and replace the gasket.