I don't know any trick here. Like he said, try prying out while turning. Or maybe in combination with vice-grips on the bolt to allow pulling/prying out as you turn?
What really surprises me, is a stripped crankshaft flange bolt. Does the flexplate use 1/2" fine thread bolts like the manual transmission flywheels do? I've never happened to see one strip. Was it perhaps an old bolt that might have been damaged or less than a grade-8?
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926} 
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