Thermostat problem

One of the last problems I had to solve was the water temperature rising to high and the loss of engine coolant;

took out the thermostat and drove the car a while without thermostate and temperature was fine so I bought two new ones (one for the carb setup 82°C and one for the EFI setup 88°C  ).

New and old part ; left 82°C side and right side EFI 88°C

Before I could instal the 82°C thermostat I had to drill a little whole in it (4,5mm) for the airbleed.

 After that I installed the thermostat and all coolant and heating problems were over.