I've had this boat about a month. It is a formula, with a 454 magnum carbureted. I'm not sure what generation that makes this engine (V maybe??).

It tends to run around 140-150 degrees. That seems a bit cool to me, but I've never had a boat like this before. Does anyone know what the proper/oem thermostat should be for this engine?

sounds like you don't have any thermostats installed.

It goes by engine serial whether it takes a 140 or a 160 t stat for the 1992 thru 1994 carb 454 mag. You need to post ur engine serial number to get the correct one. Boat owners need to know this - ENGINE SERIAL is the most important thing to know along with your outdrive serial number. Why so you can follow proper procedures and install the proper parts for your app. Year of the hull means nothing. Service manuals go off the same info = engine serial number if working on the engine and drive serial number if working on the outdrive. FYI

140-150 water temp is normal for a carbed 454mag.

Perfect.

Not if it needs the 160 t stat - its running to cold and temp gauge is spot on and that will cause rich conditions especially at idle speeds

Serial number needed

He mentioned it's carbureted.

If it was EFI, I would 1 million % agree.

My lord carb apps take a 160 degree t stat bet you a million dollars

3 to 1 odds any takers

Man when are you guys going to learn - I am like EF Hutton when I speak everyone listen.

Engine serial number always needed, I preach that up here everyday. Follow my advice please and thank you.

click on the link for parts below - NOTICE 454 MAG CARB APP 1992 thru 1994 and then scroll down to T stat standard cooling . Notice it goes by serial number.

I have posted a bunch of times that since 1996 all marine carb engine went to 160 degree t stat.

1992 thru 1994 454 MAG CARB app - parts below.

Part number 5 - 160 degree t stat. so with that said what is your engine serial number once again

http://www.marineengine.com/parts/me...-thru-0f304999