[Mgs] Mgs Digest, Vol 174, Issue 7

[Harlan Jillson]

Exhaust manifold

Sent from my iPhone
As you have discovered, the early & later manifolds look the same.  They will both work, but they have to have a matching intake to go with it.  Really the only difference between the two is the thickness of the flange where it mounts to the head.  If the intake and exhaust don’t match you’ll have trouble with sealing because the clamp washer won’t put equal pressure on the manifolds.  I don’t remember which is which is which, but one of them is about 1/16 of an inch thicker than the other. Just make sure they match & you’ll be ok.
Harlan

I 
> On Nov 16, 2021, at 1:01 PM, mgs-request at autox.team.net wrote:
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> Today's Topics:
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>   1. MGB exhaust manifold (S.Carr)
>   2. Re: MGB exhaust manifold (Barney Gaylord)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Mon, 15 Nov 2021 18:10:12 -0500
> From: S.Carr <britfan1 at epix.net>
> To: MGs <mgs at autox.team.net>
> Subject: [Mgs] MGB exhaust manifold
> Message-ID: <2145325897.39869.1637017817033 at epix.net>
> Content-Type: text/plain; charset="utf-8"
> 
> The Moss catalog lists two different part numbers for the stock cast-iron manifold?depending on the years fitted?but the drawings look identical.  Can anyone supply the casting numbers for each?  We don?t know what we have.
> 
> Thanks in advance,
> Sarah Carr
> BN1 in PA
> 
> Sent from Mail for Windows
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> Message: 2
> Date: Mon, 15 Nov 2021 22:25:48 -0500
> From: Barney Gaylord <barneymg at mgaguru.com>
> To: S.Carr <britfan1 at epix.net>,MGs <mgs at autox.team.net>
> Subject: Re: [Mgs] MGB exhaust manifold
> Message-ID: <mailman.4.1637089201.3497.mgs at autox.team.net>
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> 
> The casting number is commonly one digit
> different from the final part number.  I think 
> they made the finished part drawing first, then 
> made a copy of it to modify the drawing to show 
> more material on the casting before 
> machining.  When assigning drawing numbers, the 
> finished part number was first followed by the 
> casting number.  Some castings can be machined 
> differently to make different finished parts (with different part numbers).
> 
> Barney Gaylord
> 1958 MGA with an attitude
> http://MGAguru.com
> 
> 
> At 06:10 PM 11/15/2021, S.Carr wrote:
> 
>> The Moss catalog lists two different part 
>> numbers for the stock cast-iron 
>> manifold?depending on the years fitted?but the 
>> drawings look idendentical.?  Can anyone supply 
>> the casting numbers for each??  We don???t know what we have.
>> 
>> Thanks in advance,
>> Sarah Carr
>> BN1 in PA
>> ....
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> End of Mgs Digest, Vol 174, Issue 7
> ***********************************