John:
The obvious differences are between the Dual Carburetor manifold which
has the three ports merging to two outlets and the Single Carb. Manifold
which is a log design with attached inlet manifold.
The Single carb. design was used in the US from 1975.
Of the Dual Carb. design there are two variations the early one fitted
to HS equipped carb. cars has a thicker flange than the later one fitted
to cars with the HIF carbs.
I had to do a lot of research on this during the Moss supercharger kit
development. I cannot guarantee that the change from thick to thin
manifold flange was at exactly the same point as the change from HS to
HIF, but it appears to be at the same time period at least. It's a bit
tricky as the intake manifold casting number does not change, so you can
find thick and thin manifold castings with the same number! The change
point for the HIF is approx. 1972.
If you think this is fun, just try measuring headers and after market
intake manifold thicknesses. They are all OVER the place.
That's why Moss included a shim kit with the supercharger setup, so that
any home mechanic without access to welding or milling tools could
ensure that the manifolds were clenched down correctly. The supercharger
intake manifold is designed to be exactly the correct thickness to match
the early thick cast iron manifold.
Hope this answers your question
Kelvin.
-----Original Message-----
From: owner-mgs@Autox.Team.Net [mailto:owner-mgs@Autox.Team.Net] On
Behalf Of Bernie
Sent: Tuesday, December 12, 2006 4:59 PM
To: mgs@autox.team.net
Subject: EXHAUST MANIFOLD
could I get an opinion of weather all the Exhaust Manifolds for the "B"
were
the same or were there different types for different years of the "B" ?
Thank you
John
71 MGB
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