ACDelco GM Original Equipment Engine Intake Manifold Gaskets seal the intake manifold to the cylinder head intake ports. They help prevent the loss of fuel/air mixture from the intake manifold and help prevent dirt/debris from entering into the engine and intake ports. These engine intake manifold gaskets feature high-grade rubber, and are GM-recommended replacements for your vehicle's original components. These original equipment gaskets have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.