Hi all, I'm working on a frame-off restore of a '50 Super with the straight 8. Engine and chassis are about 95% complete, but I have run into a question with regard to attaching the manifolds. The first and last studs that attach the manifold to the block appeared to be broken off. I removed the first broken stud with an easy out, then moved on to the last. On closer look, the last one (closest to firewall) looks more like a set screw. I started thinking, and then tried finding pictures of the straight 8 on line. I found a number of pictures where it appears that there is no stud/nut on the ends of the manifold, they are loose.
Should there be a nut and stud on the first and last positions on the manifold? Or are these meant to be loose? I know that too much torque on these studs can lead to the exhaust manifold cracking, so I'm not sure if thats why there is no stud there. But my instinct tells me there should be a stud and nut securing them at each location along the manifolds.
Can anyone clarify and let me know what I should do here, and if these should be loose without a nut, why?
Thanks!!
Last edited by mpanderson; 09-16-2013 at 06:37 PM.
I have seen them both ways, but I don't know the explanation for the difference. On the ones that didn't have a nut, the stud was short with no exposed threads, about like on a Chevy 235. On the Chevy, that stud serves only as an alignment pin.
Ray
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