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I was planning on adding a coolant heater to my Mack 673 by removing the large round port above the starter  I made a tool by cutting a large washer and welding it to a socket to get a good fit but it won't unscrew  so them I may go with a tank style heater .  any thoughts ?

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It will take some light heat to get those plugs out after all the years.  Pretty sure there is an o-ring behind it as a seal.  Or was it just a gasket?  I had to remove my heater due to changing to spin on filter head and there wasn't room for the block heater. 

Mine was in the middle on the driver's side of block.  Once I cut up the original fitting for the heater I was able to clean up the threads and install a factory style plug.

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Larry

1959 B61 Liv'n Large......................

Charter member of the "MACK PACK"

 

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