Is there a Collet/flow reducer/ring inside exhaust manifold

[Adrian89]

Hi,

I have a clunking/rattling inside the exhaust manifold where it just becomes the one pipe. The manifold is a standard mild steel Tri-arm 4-2-1 (as far as I know), Basically there is a large piece of metal rattling about inside it, which is larger than the exit pipe. Unfortunately it is round the first bend and can't be seen with a torch so I have know idea what it is.

Was there a flow reducer ring of some sort fitted inside of these headers? I suspect what ever it is could potentially block the flow which obviously isn't good for the engine. Before I chop the manifold open to remove it and get it welded up does anyone have any idea what it could be?

On the subject of manifolds, when removing them 5 studs came out of the head with the nuts rusted solid to them. I have some stainless steel threaded bar of the right pitch I am going to use as replacement studs. My question is should the studs be screwed all the way into the head before the nuts are installed? It appears the genuine/original studs can't have been screwing until they bottomed out because of the step in their shank.

Thanks very much

Adrian

[Davez29]

I think there is something inside, If you look around the web there is a picture showing a cut through pipe, not sure where I seen it perhaps vsource?

Only time I replaced a stud the way you are doing it was with a 125, all I done was cut the studding to length screwed a nut half way, approx where the unthreaded part would be, finger tightened up to the nut, nipped the nut up lightly popped the header on and added the manifold nut, leaving a suitable gap, not tightening to much.

Dont forget to add some copper slip, makes things easier to loosen at a later date.