[Porky]

Welcome to a great forum!

Thermostats are designed to keep coolant IN THE RADIATOR to maintain the correct temperature. I would drain all of the old coolant and put a new thermostat in and see if it helps.

Sam

 

[Porky]

Everywhere possible??? A GOOGLE check found many topics about your thermostat:

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[Porky]

Retarding the timing is what normally makes an engine run HOT!