This web page was compiled by Andrew Yue.
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Original carbs on any car will eventually wear
out making for subpar performance
This page contains
the some options for 1975 or later MGB owners wishing
to improve performance
by replacing the stock single Zenith/Stromberg set up.
Let's start with removing
the original single Z/S factory set-up
that used a dodgy combined
intake and exhaust manifold assembly.
Above is a single Zenith conversion
done by Barry Kindig in California.
He did away with the restrictive
factory combined intake and exhaust manifold.
The simplicity of the design
is a joy to behold. That's the worlds biggest heat shield.
Picture above is Barry's own intake
manifold design,
along with a readily avaiable
exhaust header type manifold.
The result is a design that allows
the engine to really breathe,
which allows for a more fuel
and air to reach the cylinders at wide open throttle.
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Installing SU Carbs
In contrast to the
simple design above, I opted to install the
stock dual SU carburetors
found on the 1970 and earlier MGB's.
Things begin to
look a tad more complicated,
because of the extra plumbing involved.
What you wind up with, in addition
to two idle screws,
two choke and throttle linkages
to set up, is two hoses to
everything to include the fuel
inlets, float vents, and PVC hoses.
The later SU manifold allows for
the use of the original vacuum
take-off for the power brake
booster that was added in 1975
and if desired you can keep the
original smog pump.
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The Weber DGV Conversion
Things begin to look much simpler in this image.
This is Wayne Kube's 1979 MGB with a Weber DGV installed.
