Mr. Gasket 576 Pontiac V8 Valve Cover Set Manufactured from high-density cork rubber blend gasket material Provides excellent sealing and durability Available in standard or extra thick to provide additional valve train to cover clearance For OE replacement high performance street and drag race and oval track Fits Pontiac engines with displacement 326 455 5.3-7.4 8 1963-76 3/16 - inch thick with locating tabs