Mr Allen is 100% correct. Your best bet is replacement with original
cast iron. I can not believe there is not a loose one flooding around
on this list some where.
Safety Fast, David Deutsch
You wrote:
>The standard exhaust manifold for the dual-SU 'B' motors was a pretty
>efficient design; it is unlikely you can install a header and get
better
>performance out of a fairly stock motor. Also, being cast iron, it
tends
>to keep the heat in better than headers. This is important as the
carbs
>sit above the header and you are likely to 'heat soak' the float bowls
>in hot weather and/or slow traffic. Finally, all headers are not
created
>equal. The sheet steel that makes up the manifold seal can be somewhat
>thin and flimsy -- thus exhaust leaks are an ungoing maintenance
>headache.
>
>A new cast iron manifold can be a good value.
>
>--
>Bob Allen, Kansas City, '69CGT, '75TR6, '61Elva(?)
>"Never use a big word when a dimunitive one will do."
>
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