Smoking black from exhaust

[Cobb123]

I have a 308 1992 motorhome RV
Did they make a RV I can't find any think on Internet
Any she starts fine but the is black smoke
I was told its the head gasket cos there is a port water and there is a port oil it's your oil port gone it that's true

 

[Dean Fletcher]

Hello and welcome my first thoughts would be head gasket??