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Discussion Starter #1
my stock 71 460 exhaust manifold stud nuts.left side 7/16 fine thread.
right side 7/16 coarse thread.
threads a little rough,rusty so i brushed,wire wheeled them and tried to find nuts.
they clearly are different.
coarse nuts thread all the way up but seem a little loose compared to putting them on a good separate bolt that i know is sae.
i intend on keeping the stock manifolds to start. curious about this.
btw i can easily see the difference visually.
 
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