95 Isuzu Rodeo 3.2 harmonic balancer question!

Howdy folks, Stu here! I'm a newbie to the forums but have noticed there seems to be a lot of knowledge here! Anyhow my question is on my wifes 1995 1/2 Rodeo 3.2 sohc v6. The hormonic balancer is shot on it so I've got it all torn down (radiator and ect) to the balancer/pully assembly but cant get the crank bolt broke loose with my 1/2" ratchet! I understand it to be torqued at 123 lbs so I know it's tight but I wnat to make sure it isnt some backward thread type thing before I put my impact gun on it! Thanx for any help and info, Stu