I remember a post some time ago by someone with manifold leak problems,
and the response was that there were different manifolds with different
flange thicknesses on different years. So someone out there has this
information...
wizardz@maxinter.net had this to say:
>Hi all....
>Hey Lawrie... I pose this question to you more than the rest of the list
>since
>I assuming you have ... at least... seen a greater variety of exhaust
>manifolds for
>different vehicles.
>
>I just this morning noticed a variance in the two exhaust manifolds I have
>sitting about. Specifically I've noticed a difference in the thickness of
>the mount flanges. Both are the stock type 3-to-2 cast iron.
>
>One unit says 'MOWOG' on the rear down tube with '12H709' on the front tube
>this unit has a flange thickness of roughly 0.56"
>
>The other unit says 'AGA E1' (where the other said MOWOG) and it's forward
>tube
>says '12H 3911' This one's flange is only 0.43" thick
>
>I've not had a chance to measure the thickness of the intake manifold for
>the SU's
>
>Since neither is on a car I'm not sure which of my two GT's either came
>off of.
>I'm assuming the true MOWOG unit cam off of YB (my primorse GT) since it had
>a Weber downdraft andstock exhaust on it as purchased and the 'PIERCE'
>manifold
>for the Weber has a flange thickness of roughly 0.57"
>
>Other than the flanges...they are almost indistinguishable from one another.
>why do I wonder about this?
>
>I guess in properly mounting them.. or if one were to end up with one of
>these
>it would make getting a good gasket seal rough.... as the thickness
>difference
>as compared to an intake manifold would not allow the stubs to hold both
>tight to the head if the thicknesses were this much different.
>
>I guess I'm asking if you have ever run into something like this.
>
>Paul Tegler
>Twin 73' MGB GTs YB and OB
>YB born 8/72 (Primrose Yellow) Yellow BGT
>OB born 1/73 (Blaze Red) Orange BGT
>North of Annapolis, South of Baltimore
>email: wizardz@maxinter.net
>http://www.amdyne.net/~ptegler/mgmain.htm
>
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Max Heim
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