I don’t have a thread pitch gauge, so this is all I can do. HTH I’m the second owner of my GTO , so pretty sure it’s original.
BTW, I see you’re in central Fla. I have a son in Deland.
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‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
‘55 Catalina
‘62 Mercury Meteor-all original, bought new by my grandfather
71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.-now my sons ride
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