Did you check the timing to make sure you had enough Advance?
Did you check the carb to make sure the carb calibration was not too lean at idle.
Both can cause cooling issues (with the best radiator).
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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