Thank you Steve, Doug and the others that responded to my question.
I found and purchased a NOS manifold on ebay (CAM1314.) This manifold
has the "C" stiffener in the casting. I am still confused about the
part number however, because during my search on ebay I saw a close up
picture of a used manifold that did NOT have the stiffener and this was
a CAM1314 part number as well. Once I take off my cracked manifold
(which is original) and see what the part number is, it may shed more
light on the mystery.
Thanks again for everyone's input.
Steve Sanchez wrote:
>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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