Ron:
The square pattern 1735919 manifold could be drilled for the bigger WCFB
carburetors, but the "clover leaf" holes would also have to be made larger.
Making the larger "H" pattern work for the smaller square carburetor would
be a bit more difficult.
If you look carefully at your photos you will see that the "cloverleaf"
hole openings are larger for the larger "H" pattern WCFB. In fact the larger
openings are most likely 1-11/16 inches or a bit larger whereas the smaller
2552S/2553S openings are 1-5/16 inches. The difference is 3/8 inches. This
could be enough to prevent a tight carburetor/manifold seal without special
considerations such as an adapter plate. In my research, I have not found an
adapter for this, so it would have to be made.
As for the AFB carburetor usage, it would be possible if certain things
are known. They are:
1. The AFB flow rate would have to be matched to the 303 engine. I'm no
expert to know what would work.
2. The 1735919 manifold is constructed so that the left and right bank of
engine cylinders are supplied by the right and left sides of the
carburetors. The manifold is open front to back. Therefore, the linkage would have to
be solid rather than progressive to prevent fuel starvation of some
cylinders. With progressive linkage, if the engine were to run off the front
carburetor at low rpm, the rear cylinders would be starved of fuel and vice versa.
Cast iron intake manifolds are completely open and this is not much of a
problem.
3 The 1735919 manifold does not have provision for a choke heat tube, so
either a manual choke would have to be used, or some sort of internal choke
will have to be employed. I do not know how the AFB choke works.
When I started looking into the aluminum manifold situation, I
discovered that before I got mine, someone had removed the "clover leaf" and part of
the web for each carburetor making an open chamber manifold. I will be
sending the manifold to Wilson Manifolds in Florida to have it reconstructed as
original. I also learned that if you are to put carburetor studs, water jacket
or vacuum fittings in an aluminum manifold that it is wise to put something
around the threads. Otherwise, the threads and aluminum will seize together.
I had to have mine drilled at no small cost and still small bits of the
threads were lost. Nothing serious, but enough to teach a lesson. I'm told
that Teflon tape will prevent leaks and seizing so that is what I plan to use.
I hope you enjoyed my comments. Aren't 56 Fury's fun?
Regards,
John Teske
[Non-text portions of this message have been removed]
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