If the mounting faces are badly warped then you may have problems
getting a good seal. Deciding just how bad is bad is really a matter
of experience, I guess. Do you have a decent straightedge to
check? Usually I use a Scotchbrite pad in a die grinder to
clean up the mounting faces of exhaust manifolds before
putting them on a car. Often that is sufficient prep work.
Using decent gaskets will help seal as well. Moss Motors offers
what they call a High Performance gasket made of a fibrous
composite material, which sell for something like $35 per pair,
Moss number 695-070.
For about twice as much one can get a set of compacted
graphite gaskets from Uncle Jack Drews, a well known
fellow in Triumph vintage racing circles. These are
probably overkill for a street car, but they do work.
mjb.
_______________________________________________
Bmcu mailing list
Bmcu@autox.team.net
http://autox.team.net/mailman/listinfo/bmcu
|