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The risk is some of the used ones could break.
Look at the used ones you may buy first.. there is a satin black coating on them and if it's chipped or scratched away anywhere then corrosion could get started and lead to a stress riser in the metal. Then there is a greater risk of the stud breaking in that spot.
The used set of 24 I sold for $50 included the original Porsche Barrel nuts and washers. I even cleaned the rust off the the barrel nuts and washers in phosphoric acid and then sprayed them down with WD40 so they would look nice and not rust.
I don't think used dilivar head studs are worth much.
I used ARP head studs when putting the motor back together. I have more confidence in them.
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