Testing a thermostat - New hot EFI engines

Just tested the new thermostat for the Commodore. My old RX-7 had a 80 degree thermostat, and I could test it in a coffee mug by pouring water onto it from the kettle and watching it open. The commdore is fuel injected and runs hotter, and the thermostat is rated at 91 degrees. Pouring water from the kettle over it just doesn't get enough heat into it to get it opened up. You need to boil some water on the stove and dip the thermostat into it on a piece of string. It will open in half a second or so. As soon as I finish this shift in the shop, it's going in.