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Removal of the thermostat helps to reduce engine temperature, however a thermostat blanking sleeve should be fitted to maintain correct coolant circulation to the entire head. Failure to do so will cause overheating around #3 and 4 combustion chambers-with obviously disasterous results. When the blanking sleeve is used, it is also necessary to blank off the by-pass hose (not found on late heads) between the head and water pump.