Replcement Timing Cover Gasket CO218Replcement Timing Cover Gasket 218 CO218 Suit CO217 BB Chev Gen VI 2 Piece Cover BB CHEV GEN VI TIMING COVER Eliminate timing cover flex which causes erratic ignition timing Allow camshaft to be replaced without disturbing the oil pan seal Simple endplay adjustment with dial indicator access hole Integrated timing pointer simplifies ignition timing checks Compatible with all water umps and most gear drives