Sierra 18-0664 Valve Cover Gasket The Sierra 18-0664 Valve Cover Gasket is interchangeable with the following: GLM 30357, Evinrude/Johnson 913270, 3852687, Mallory 9-61305, Mercruiser 27-17467, FI1101287, OMC 3852687, 913270, Volvo Penta 3852687. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Valve Cover Gasket Meets or exceeds the original equipment quality Sierra part number: 18-0664 Interchangeable with the following: GLM 30357, Evinrude/Johnson 913270, 3852687, Mallory 9-61305, Mercruiser 27-17467, FI1101287, OMC 3852687, 913270, Volvo Penta 3852687