I believe a 5/8" standard thread tap works well on the Chevy pilot bushing. It's not really necessary to put a bolt in the hole; just keep cranking on the tap when it bottoms out. The bushing will just walk out of the hole and climb up the tap.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!