Spark plug set 816761Q5 is for use on 4-cylinder MerCruiser engines with conventional points ignition systems (1963 through 1995). The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier...

Spark plug set 816761Q16 is for use on V-6 MerCruiser engines with Thunderbolt IV ignition systems (1985 through 2003). The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier supplier of...

Thermostat O-ring style rubber gasket 806871Q is for v-6 and V-8 mercruiser stern drive and Inboard engines made by general motors using the newer style, one-piece thermostat Housing. It can also be used on cruiser 4.5L MPI (multi-port injection) and 6.2L mph engines (small/N 2A456613 and up). the Q...

Spark plug set 863656A1 is for use on V-8 MerCruiser stern drive and inboard engines (5.0L, 5.7L and 6.2L MPI) with ECM 555 (serial number 0M300000 through 2A455878). The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 6...