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No seal for the FDC, apparently metal to metal seal with honed surfaces. The thermostat begins to open at 180°F and is fully open at 190 or so. These engine rarily runs above 185. The engines are pretty efficient as is the cooling system.... Best way to clear up the smoke is to take the truck on...

If the compensator is not leaking fuel into the crankcase, there is no need to bypass it. Its function is to adjust the fuel delivery based on its viscosity (=BTU value) so that the engine power output remains the same for a given position of the "gas" pedal. It has nothing to do with the...

An explanation of the title would be in order, which engine?

Please, do a search on this site, subject has been covered multiple times....access forum and use search function in the heading, keywords like "FDC", "bypassed", etc...