I just wanted to cover that possibility. Been down that road but not in the Blazer. Took too long to get heat in the winter, didn’t like it.not any more i took it out and installd a regular 180° thermostat
I normally ran a 180 in my K5 until I installed an 190/195 to get enough heat in the winter.
Runs on the first tick on the factory gauge in the summer.
Just a mild 350 Gen 1.