Mercury - 811635K2 Distributor Cap and Rotor Kit GM 3.0L 4-Cylinder Engines Delco EST Ignition 811635K2. Overview. Anyone who's spent time around boats knows how good it feels when your engine fires up right away - that quick spark, the smooth idle, the steady rhythm that tells you everything's working like it should. The Mercury 811635K2 Distributor Cap and Rotor Kit helps keep that moment dependable every time you turn the key.. Built for GM 3.0L four-cylinder MerCruiser sterndrive engines run