Have a 27 mm crankshaft pulley bolt that is resisting removal. Initially used a 1/2" air impact wrench with a max torque of 420 lb-ft; switched to a 3/4" impact, with a max torque of 700. Using a 6" extension bar with both to gain access to the bolt.

Unable to budge the bolt at this point. Any suggestions? Move up to a 1" drive? TIA.