Thermostat Housing Gasket | Pleasurecraft RM0001 PCM Thermostat Housing Gasket | Pleasurecraft RM0001 Thermostat housing gasket for PCM Ford V8 small block marine engines. Fits Pleasurecraft Marine Ford 302 and 351 cu. in. marine engines Original PCM Replaces Mercury/Mercruiser 27-54506 Replaces OMC/Johnson/Evinrude 3852456 Replaces Volvo Penta 3852456