Yes, and it's an easy fix to go back to studs. Simply screw bolts with the right thread length into the threaded holes on both ends, and cut the heads off. Instant guide studs. The thread is 3/8-16, and if you choose the right length bolts, cutting the heads off will leave an unthreaded portion sticking out above the surface of the head. The only purpose of the studs is to align the exhaust manifold on both ends so the remaining bolts and clamps keep it in line with the gasket. The end holes are oversized on purpose to allow for linear expansion.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!