I bought some flanges from JC Whitney, planning to do the exact same thing
myself.  They have a good selection.
You need a 2-hole instead of a 3-hole variety, or there will be
no room for it.  Even then, it will be a tight fit.  I am also
planning to add an extra short bracket to the flange on the header
so it can be fixed to a bolt on the bellhousing.  This
will relieve strees where the header attached to the engine itself.
I also wanted to put a flex-joint right after the header, but
I couldn't find one small enough to fit...
Doug Braun
'72 Spit
At 05:23 PM 4/2/01 , you wrote:
>I have a replacement header to fit to my Spitfire, just the ordinary 4-1 
>version to replace the cracked one on there now. Originally, the center 
>pipe was just held to the header with a clamp. This was marginally OK, it 
>tended to leak a bit and was a struggle to get apart for rearend  work. 
>When I had a new exhaust system made up last year, the shop did a great job 
>except they WELDED the center pipe to the old header - not good - can't 
>remove the exhaust easily.
>
>So now with the nice new header to go in, I want to do something better. I 
>am thinking a bolt together flange to join the header and center pipe would 
>be a nice way to go. Anyone out there done it before? Any suggestions for 
>where to find such a beast? That way I could easily take the exhaust on and 
>off as maintenance needs require.
>
>Kevin Rhodes
>Freddy the Spit 
 
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