MerCruiser Thermostat housing for raw-water cooled 2.5 & 3.0 ltr. in-line engines

Modeltypes:

Mercruiser 120 GM 153 I/L4 1964-1986 S/N: 1666601-0B531853
Mercruiser 140 GM 181 I/L4 1968-1986 S/N: 2508261-0B450800
Mercruiser 160 GM 250 I/L6 1967-1969 S/N: 2048022-2770031
Mercruiser 165 GM 250 I/L6 1970-1981 S/N: 2770032 & upp
Mercruiser 2.5L GM 153 I/L4 1987-1989 S/N: 0B531854-0C856558
Mercruiser 200 GM 292 I/L6 1969 S/N: 2453769-2712072
Mercruiser 3.0L GM 181 I/L4 1987-1994 & 1998 S/N: 0B450801-0F353099 & 0L010042-0L096999
Mercruiser 3.0LX GM 181 I/L4 1990-1997 S/N: 0C856559-0K999999
Mercruiser 3.0L GM 181 I/L4 S/N: 0L097000 & up