I believe different manifolds from different years had different flange
thicknesses, so your problem is not uncommon in a "mix and match" situation.
Usually, shimming the washers is the solution.
on 3/23/03 1:10 PM, Marc at smarc@abs.net wrote:
> Thanks to Jerry and David for the reply. I asked as I wasn't sure if I had
> done it correctly. I did, and my reasoning was sound! Anyway, I still have a
> slight vacuum leak at the intake manifold even after replacing the gasket. I
> also replaced all four manifold studs and nuts. This is a ZS to dual SU
> conversion. I note that the flanges on my intake are slightly thicker than
> those of the exhaust manifold. I cut a few washers to shim the difference,
> but the leak is still there. I could have the manifold belt-sanded to take
> off the difference, but I wonder if maybe my exhaust manifold (of unknown
> origin) is too thin...
>
> Anybody who's done this conversion come across (and solved) this issue?
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
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