Re: Question on 18 HP cylinder heads

[Don]

Well, I remember that the early thermostat models had a completely different thermostat cover/gasket, probably routed the water a bit differently as well. But, am guessing you could interchange the complete assemblies. The older ones definitely won’t work on 73 models due to the mounts for the external coils. The head gaskets are the same part number. Don’t know what the situation is surrounding the sale, but expect it to be returned if the thermo cap/gasket is different from the one you have….