The intake manifold gasket is a malleable material that goes in between the air intake manifold, the cylinder heads and the block.
This gasket prevents the leakage of air or air and fuel mixture by sealing the gap between the various metal parts of the engine.
Gaskets included vary by engine type but include carb base, manifold o-ring, rotary cover o-ring, flame arrestor, intake manifold, and reed gasket.