[Bob Broberg SPF667 460BB]

Tom, I had the same problem with my chrome thermostat housing. I placed it upside down in a vise and took a long flat file and flattened the base as best I could, then put it back on with gasket, "O-ring" and Permatex. No more leaking. I took the oportunity to change the thermostat as long as it was off.

AZ Bob