Reply To: coolant in a 12

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I use water and rust inhibitor in my ’34 1240A. You have some more tuning work to do because you should not hear it boil unless it is very hot outside.

Check your basic ignition timing and your synchronization. Is this a new radiator core or the original?

Do you see the temp gauge shoot up when you shut the engine off? I used to but I don’t any more. (A new radiator core fixed that problem).