It's a bolt from '60 until sometime around '72 or '73, then it's a stud from then on up, p/n 152 568, as offered here. If I recall correctly, the stud is larger diameter and thread than the bolt; on occasion when using later exhaust manifold with earlier intake I had to overbore that bolt hole in the intake.
Okay so anything extra required when using a later intake manifold and the factory exhaust manifold, it’s a 72 demon but I got a super six intake off a 79 if I rember correctly
