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		How hard i tried, the gasket would not seal- even if it's a OEM Ford thermostat housing, so silicone was the way to go. It seals.  
 
Wonder if silicone on the intake side, then a gasket & bolting the housing on to let dry would make it possible to remove the housing later, for instance to test another thermostat, and then refit without changing gasket or apply fresh silicone would work? 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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