use a propane torch to heat only the gear and not the cam snout, move the torch around in a circle pattern and have your pry bars at the ready, use common sense on the amount of force you are putting on it. you want to get the gear to about 300. A finger dipped in water quickly touching the gear will sizzle when its about 250-300. What type of retainer holds your cam in. It is also possible someone used locktite on the bolt and some got into the gear fittment.