ACDelco GM Original Equipment Engine Timing Cover Gaskets are installed between the timing cover and the engine block to create a tight seal that helps prevent engine oil from spraying or leaking onto your vehicle's engine, while helping keep dirt and debris out of sensitive engine components, 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.