March performance vs cvf pulleys on 340

Just to chime in here, propane works without a doubt. But I much prefer using an oven. We have one just for parts, but with a nice clean pulley you'd be safe using your house oven.

It's much easier to control how hot you get it, and you're not juggling heating the pulley and trying to freeze the shaft (dry ice is the best for that, you won't get much below 0 even though the ice is -100, but you don't need to heat the pulley as much)