Stock exhaust manifold bolt isn't long enough

[Robliepse]

In the process of installing the stock 1972 HP Exhaust Manifolds on my 440 Roadrunner GTX and the rear stud / sleeve on the driver's side isn't long enough to make it through the manifold. It appears that the stud is about 1/2 too short. I bought a new bolt kit and all the studs were the same size and it came with 2 longer nuts / sleeves for the passenger side and a shorter one for the driver's side. The sleeve / nut would work if the stud was longer. It also looks like there would be some type of inner sleeve around the stud between the head and the manifold. Does anyone know if I need a special stud or spaced for the 1972 stock 440 exhaust manifolds?
I'd also like to know what others have done with the manifold heat control valve. The service manual calls for seals and bushings which I'm sure are all but impossible to find and I'm missing the spring and most of the smaller parts. I was thinking of removing it and finding something to seal the holes.

 

[Cranky]

I never run the heat riser setup and the holes can be plugged. You can either tap them for screw in plugs or surf around for the press in one but I like the screw in plugs better....that is if you're not concerned with it being factory looking.

 

[silversedan]

you should be able to get a longer stud from an auto parts store, Car Quest, Napa etc.

 

[Robliepse]

Thanks Silversedan, any thoughts on the purpose of the small spacer? You can see how the end of the bolt hole is wider but I don't remember removing a spacer. I guess that whats happens when 2 years separate the disassembly from the assembly

 

[silversedan]

someone might have put the spacer in there cause they had a sleeve nut that was too short (there are different lengths) , can you take it out with a punch or something?

 

[Robliepse]

there is a place in the actual casting for what appears to be a spacer. Its visible in the picture. Im not sure if it was for thermal expansion or to protect the thickness of the casting from over torquing but I have to think it was put there for a reason. you can see the recessed area within the bolt hole. Hummmm, no problem with getting the longer stud but I like to understand the "why" in these type of unknowns.

 

[oldbee]

Maybe it was a "Monday" or a "Friday" and it got machined a little wrong????? Best guess I have..

 

[khryslerkid]

The shoulder is for the threaded sleeve, nut, that threads over the stud that would be in the head. Think about the shoulder looking at it from the outside not from behind it.

http://www.classicindustries.com/product/mopar/parts/mn1501.html

 

[64 Post]

Mancini carries them if you can't find them locally.

 

[Robliepse]

i bought the bolt kit and the distance of the cast material from the engine side to where the sleeve goes in from the outside is greater than the length of the stud. When the stud is screwed into the block and the manifold is installed the end of the stud isn't long enough to enter the area where the sleeve slides into the manifold. The female threads of the sleeve have nothing to screw on because the stud isn't visible

 

[khryslerkid]

There are different sets for each manifold made. Maybe you have the wrong one.
Also doing some measuring, you can use a longer stud. You might find a longer one at your local parts house.

 

[Robliepse]

Still curious about the larger machined area on the inside of the head facing hole. I think there was a steel sleeve to help reduce the pressure on the thicker casting. If the casting went all the way to the head it might have been too thick to withstand the pressure of the bolt so they added a steel inner sleeve. This is what happens when you don't bag and tag enough during disassembly and what you thought would be a 3 month job turns into a 2 1/2 year restoration. Getting closer

 

[khryslerkid]

The bushing you mentioned is a good possibility.
Someone on here must recall seeing what you have. Would a service manual show the breakdown on the manifold hardware?

None of the stud kits that I just looked through shows them.

 

[oldbee]

Service manual mainly shows close ups of heat risers and pipe/muffler hanger locations. No help there.

 

[Robliepse]

Figured it out, it appears that the previous owner didn't have the correct parts so they cut a metal sleeve and installed it in that end bolt hole. I took a punch and a hammer and removed that home made sleeve and now the proper stud and proper sleeve that came with my bolt kit fit. I finally found the original (and wrong) bolts that I removed over 2 years ago and thankfully labeled the ones I removed and put 2 X 2 together. It's all good now

 

[khryslerkid]

Great to hear Rob! Thanks for the follow up