I am embarrassed that I cannot locate the leak. It happens when fully warm, at cruise (60-65 mph). It SEEMS to be at the junction of the thermostat housing and the block, at the base of the valve cover (front and center).

But, when fully warm, with a stick braced on the throttle at 2800 rpm, no evidence. Cruise down the hiway, gets warm, you can smell it, get out and there are very limited "spots" of spray on hoses. Topside only, And residue at the front/center location. I have pressed fittings, squeezed hoses, no luck. Some corrosive looking areas on the thermostat housing under the temp sensor leads area. I even suspected a tiny crack in one of the heater hose metal tubes, but no luck.

Thanks for any suggestions

Any suggestions?