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Rare exhaust header?

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Yes, to a certain extent, as they were only on the TR4As. They do, as this one did, pop up on ebay every now and then.
Bob
 
/bcforum/images/%%GRAEMLIN_URL%%/iagree.gif However, it's a pain to get them to fit on later TR3/A/B. I believe you have to do some grinding on the intake manifold (otherwise it hits the crossover tube); and cut the body for the dual downpipe.
Also, I vaguely recall someone telling me they required major surgery to fit TR2 and early TR3 (with low port heads), like rerouting (or eliminating) the crossover tube. Easier, probably, to switch to a high port head & source a 4A intake to match the 4A exhaust.
 
They are quite hard to find as they tend to crack, and are cast iron so not easy to weld properly.
They do seem to flow quite well, and are quieter than a tube header, so nice to have.
Got one on my car after the original cracked, that's how I know they are hard to find!
Simon.
 
If they are better then the old design, and I have no reason not to believe Simon on this, I am a bit surprised no one out there has made a stainless version. Does not look that difficult to do.
 
Simon, if you still have the old cracked manifold you might try "WELCO 94" or "WELCO NIC-L-WELD 59" arc welding rods, both from Thermacote Welco Company, to repair the crack. You will probably have to find them at a welding supply company if they are still around. They are not cheap but are excellent for the purpose.
 
Thanks, Tom, but its gone several years ago. Wish I had known that at the time.
Ray there are good headers available, some better than this manifold because they have been designed without some of the compromises made necessary by cost, ease of maintenance and other mass production considerations...on the other hand most headers appear to be designed and produced with low cost of primary concern, not function. The poor quality ones typically have short primary tubes, tight turns close to the ports, thin and poorly aligned flanges and messy looking welds. Nearly all headers allow a lot of heat to escape close to the generator, which can't be good for its life expectancy, and close to the carbs.
I had one of these "not so good" headers on my car for a few years after the original cracked, but am happy to go back to cast iron!
Simon.
 
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