Timing Chain Gasket Set | Sierra 18-4380 Front cover gasket set for Mercruiser 224 cu. in. marine engines. For Mercruiser 165, 170, 180, 190, 470, 485, & 488 model 224 CID marine engines Replaces Mercruiser 27-68714A6, 27-68714A7, 27-68714, 27-72098 Replaces Mallory 9-61010