Bob,
There were two castings for the single intake/exhaust manifold.
The first casting was prone to cracking where the exhaust made a
hairpin turn before the catalytic converter. The crack would appear
on the inside of the bend and run to the top bolt-hole of the
converter.
The second casting has a "C" shaped support cast through this weak
area.
I believe that is why there are two part numbers for this manifold.
I also know this manifold was also found on Austin Americas with a
single SU HIF6, which are interchangable with the late MGBs.
Also worth mentioning: make sure the exhaust pipe that drops down
from the converter is properly braced with a strap to the
transmission/engine restraint rod. If this strap isn't in place, the
stress and flex is taken by the catalytic converter gasket and the
manifold.
Good luck!
Steve
1977 MGB Roadster
--- Bob Sovatsky <rsovatsk@suffolk.lib.ny.us> wrote:
> I am searching various sources for the combined intake/exhaust
> manifold
> for the Z-S carb. I noticed that there appears to be two different
> part
> numbers for this manifold, CAM 1313 and CAM 1314. Does anyone know
> the
> difference between these two manifolds? Thank you.
>
> Bob
> 1977 MGB
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