Sorry for this late reply, but this site's format makes my uploads sit and spin without end.
First, there is no reason to polish the ends of the manifold, as the ends touch nothing.
The seals contact the nipples' faces, and the outside of the manifold's spigots.
Polishing the spigots themselves will make common brass seals far too loose.
The faces of the nipples may need dressing as noted in my VirtualIndian bubbletesting article.
It is not common with Chiefs, but leakage is possible between the nipples and the cylinders themselves.
The manifolds nuts obscure this seam, so each nipple should be tested separately, using a #8 rubber stopper instead of a testplate.
Brass seals must be pristine and annealed.
Modern compliant seals are available from many sources.
Last edited by T. Cotten; 06-13-2012 at 07:11 AM.
Reason: Byzantine and bizarre site format
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