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I would want to know what the two shops used? Impact guns vary considerably in maximum output torque. A decent 1/2" drive gun is capable of 800+ ft. lbs. of torque. A mediocre 1/2" gun will produce ~350 ft. lbs. of torque. A good 3/4" drive gun will be capable of ~1000-1400 or more ft. lbs. That's much more than you will be able to apply manually using extensions and such.
Application of a penetrating oil may help. Liquid Wrench or similar.
If you can only go to those shops you went to before, have them throw it on the lift so you can jam the flywheel and get a breaker bar with a big ass cheater bar on it to break it loose.
However, if the bolt is that fucking tight, you run the risk of damaging your flywheel.
How good are you at math? A 6' bar to get 1400 ft lbs.assuming the force is applied near the end puts it a 5.5'. 1400/5.5 = 254 lbs. of pressure. That's not even the point.the pully doesent spin. thats not the problem i got the motor locked up with chain vicegrips. does anyone one know if i can change the timing belt with that pully on? i think id rather drive it till it blows then drive an hour one way just to see if they can get it loose. im thinking with a 6 foot pipe welded to a 19mm socket is more torque then any impact. i snaped 2 half inch sockets and twisted a deepwell half inch impact socket.
thanks for all the help guys. i think ill just drive it till it breaks and do a h22 swap. haha.
If the lower timing cover is on the car then you need to remove the pulley.
What car and engine is it?so i can break out the lower timing cover and do it?