GM 4.3L Cylinder Head Gasket | Sierra 18-3879 Sierra marine grade cylinder head gasket fits various GM V6 262 cu. in. marine engines. For Mercruiser GM 4.3L 262 CID engine Sold individually - 2 required per engine Replaces Crusader 33408, 7057310 Replaces Mercury 27-11986, 27-816460, 27-879150140, 27-42744 Replaces OMC 912227, 914930, 3854299 Replaces Volvo Penta 3854299 Replaces Mallory 9-63707