1G 4 turbo bolts... NOT

[Red Rider]

Getting closer to getting the head off. And I see this.

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3 bolts and a stud with a nut. ??? Is this the way the factory did it? Was my car built on the day they ran out of turbo bolts? Sure hope all 4 come out.

 

[NOSLO2PT0]

That’s how they come from the factory

 

[fwdmaster]

That’s factory

 

[DSMPT]

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[Mech Addict]

Interesting though-
The most logical reason to me is that it makes it easier to assemble, as the one stud acts as a guide. But then I think about all the places where assembly is a complete Pain on these cars, and in much less accessible places than front and center under hood, so that kind of pops that idea balloon.
sometimes a stud/nut combo is used when there isn’t room to stab or remove the bolt due to access, but again that seems not to be the issue here.
Oh well, anyway, yours is stock, just as Mr. Diamond-Star intended.

 

[Gsx-Dude]

Interesting though-
The most logical reason to me is that it makes it easier to assemble, as the one stud acts as a guide. But then I think about all the places where assembly is a complete Pain on these cars, and in much less accessible places than front and center under hood, so that kind of pops that idea balloon.
sometimes a stud/nut combo is used when there isn’t room to stab or remove the bolt due to access, but again that seems not to be the issue here.
Oh well, anyway, yours is stock, just as Mr. Diamond-Star intended.

But you're right, thats the only reason for using a stud/nut combo on these cars.
The stud acts as a guide like you already said. Not because there isn't much room, but rather because it makes it easier to align the gasket between the 2 flanges correctly, like on the head/exhaust manifold, manifold/turbo, O2 housing/turbo or TB/Intake manifold for example.

 

[Red Rider]

The guide concept occurred to me, but if the stud won't come out you might have a larger pain than easier alignment on assembly.

Anyway, I started hitting these fwd and rev with 50 lbs in the air impact gun. Incrementally increased the pressure. The nut let go at 50lbs, 2 bolts let go at 75 lbs, last one took 90 lbs and spun out. At this point I'm giddy every time I get a bolt or nut off without shearing it.