My understanding is 65-66 used studs, and 67 used bolts. My 66 has studs. That being said, I can't say whether the stud setup was carried over into early 67 or not...
Importsmasher
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Scott Baggiore
66 GTO convertible 389/4 speed (parents bought new)
73 Firebird Formula 400/4 speed
74 GTO 455/4 speed
74 Grand Am
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