Replaces Mercruiser 93320 Application Mercruiser GM V6 229 and 262 CID (models 185 and 205), GM small block V8, 305-350 CID (models 200, 228, 230, 260 and 898), GM big block V8, 454 CID (models 330, 340 and 7.4L). Use with manifold 19521, 19531, 19571