Header install problems

[WonWonrides84]

What's going on y'all, I am extremely new to riding motorcycles and I have decided to rebuild a 1981 honda CB750C and I am having trouble installing the 4 into 1 header. I replaced the copper couch gaskets with some new ones. I tightened the exhaust mounts and I believe I installed the exhaust collars correctly,or did I install them backwards? But my header is extremely loose. I don't know if this picture helps. TIA.

 

[WonWonrides84]

Ps, I meant crush gaskets, not couch gaskets

 

[brettp]

Did you clean the posts for the headers? Maybe your nuts are tightened down only as far as some rust will allow.

 

[WonWonrides84]

Did you clean the posts for the headers? Maybe your nuts are tightened down only as far as some rust will allow.

The posts?

 

[brettp]

The bolts/studs you screw the nuts into to hold the exhaust flange.

 

[mrtwowheel]

Not sure from your pictures but the heavy gauge metal side of the two piece collars goes towards the engine. The one piece collars will have a gap between it and the cylinder head. It does look like too much thread sticking past the nuts, usually not that much thread sticking out after the nuts are tightened.

 

[Loose Chain]

Do you have a picture of the end of the pipe where it goes into the cylinder head?