As promised, here are the part numbers cast into the
ZS manifolds I have:
large port: V3178
small port: V3796
Thes numbers are cast into the bottom rear of the
plenum, and can be hard to see when installed.
Visually, the easiest way to determine the difference
is by looking at the top of the casting. On each side,
the tubes spread out going from the manifold plenum to
the cylinder head mounting flange. So there is a V
shaped depression between them. On the small port
manifold, this depression runs the whole length from
plenum to flange, and is about 1 3/4" long (45 mm). On
the large port, it is much shorter, 5/8" (15 mm), and
the tubes mave material filled in between them close
to the plenum.
Hope this helps if you are looking for one.
Carter Shore
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