> Hi guys, Im about to send my late model exhaust manifold(76 TR6) with
> the air injector tubes out for ceramic coating. I noticed that in some
> runners where the tubes exit the manifold, there is a putty like hard
> substance. It's white inside and coated with soot on the outside.
> There's also some of this inside where the manifold connects to the
> exhaust pipes. Is this something that should be there or can I chip
> this out? Is it there to seal those tubes somehow. Its only in a
> couple of the runners but it must really restrict flow. Any Ideas
> what this is?
Just a WAG ... sounds like lead oxide left behind when the engine was run on
leaded fuel. I'd be very careful about ingesting/breathing it ...
Randall
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