Can you help identify this bolt? 1973 Dart Sport

[Yorkman1]

What is this for and any idea how many I should have ?

 

[67Dart273]

What size? They look vaguely like exhaust manifold studs, but they don't look OEM

 

[Inertia]

6 cyl ex stud and nut (inverted).

 

[Yorkman1]

 

[halifaxhops]

Yup the nut on the right is the right one for a slant.

 

[Yorkman1]

6 cyl ex stud and nut (inverted).

Omg thank you. Well those are from the parts car then. Y’all rock!

 

[halifaxhops]

Now on the left I am getting confused!

 

[pt70]

Now on the left I am getting confused!

It's pretty clever, actually. The exhaust manifold floats on the head. The 2 end studs clamp only one part of the manifold. All the others clamp two manifolds with their special washers. So in order to lessen the clamping force on the 2 outer studs, Chrysler made special nuts and special brass washers. The washers have a countersink. The nuts have an almost matching taper. The nuts are slit on the taper side. These slits create fingers. As the nuts are tightened down the fingers squeeze the threads and limit the clamping force on the manifold. This allows all the nuts to be tightened to the same torque.