Correct fasteners for Intake and Exhaust Manifolds

[CanTechZ]

9 hours ago, inline6 said:

For what it is worth, the nut you have on the rear engine lift hook looks to me like an original exhaust manifold to down pipe nut.  I think they are made of some type of alloy - they are not plated.  You could polish it a bit and see if it shines like a new penny.  It is possible some of your hardware got moved around a bit from the factory locations.  Most of it looks right, and I can't conclusively say, but the other pieces that look suspect to me are the stacked "B" washers at the engine lift hook location under that nut, and the thick "D" washer at the center top stud for the exhaust manifold to the head (6 required and you have 7).  On your engine, "B" washers are in all the other locations that secure only the exhaust manifold to the head.  So, it seems to me that the center top stud should have a "B" instead of a "D".  I think the "D" washers are used only on the six locations that bridge from exhaust manifold to intake manifold.

Thanks for proofing my work, you are correct on the washer at the the top center stud, good eye. I have edited the image above to reflect this, it was a typo. And thanks for clarifying the type of nut on the rear stud, I was wondering about that. I believe that someone did add the stack of washers and that tall nut when the header and a custom exhaust were added. That location should have a lockwasher and regular nut, no flat washers. Thanks again.

Edited June 24, 2022 by CanTechZ