Stuck Crank bolt. How to get it out? Options

[IllIllIll]

I recently bought a 97 Celica GT Convertible. I decided to give the car a complete tune up, being that it is at 80K miles. I have the car half way apart trying to change the timing belt & water pump, & I cannot get the crank pulley bolt out. It is really on there.

I am following the directions in the book I have, jamming a screwdriver in the hole & using a prybar to keep the crank from spinning. I can keep the crank from turning well enough. My problem is this bolt will just not come loose.

I even went out & bought a $160 craftsman impact wrench, that is supposed to put out 700 ft/lbs of torque. The bolt refuses to move. Is there some trick to this? I sprayed it down with PB Blaster yesterday, last night, & again this morning. Any one have any suggestions? How tight is this crank bolt supposed to be anyway? It isn't reverse threaded is it?

[IllIllIll]

I got it off finally. My problem was I was cheap. The cheap little spiral hose that came with my ir compressor wasn't big enough to supply the air needed to run the impact wrench. Amazing what you learn when you read the manual. It came right off when I connected a 3/8" hose. Read the freaking book. My old Impact wrench probably would have worked.