Chrysler Small Block Valve Cover Gasket | Sierra 18-0609 Seals valve cover to cylinder head on Chrysler LM318, M340, and M360 marine engines. For Chrysler 318, 340, and 360 CID marine engines Sold separately - 2 needed per engine Replaces Chrysler 4095088, 4273129 Replaces Mallory 9-61308