ProChem Legend with a 20hp Kohler engine

[richd8980]

is water cooled the only way to go?

 

[Nate The Great]

air cooled the only way to go?

You should be able to get a water cooled engine to work. I have a 20hp kawasaki water cooled one turning a #4m blower.

 

[Dolly Llama]

is water cooled the only way to go?

no

There's way more TMs with air cooled engines in the field than not.

..L.T.A.