Have I read that the gasket on heater core valve leaks and that a sealant could be use instead of gasket. My valve leak pretty bad right at that gasket it's new but stiff Could I use core from t bird and move valve to be in line .
The gasket is rubber and hardens after time. I've had success with silicone sealer. The sealing area is also easily distorted making it hard to make a good seal with the rubber gasket.