Besides Robert's suggestion of the Maniflow intake manifold, the only 
other option is to modify an MGB manifold. Spridgets racing in 
F/Production in the SCCA are allowed the HS4's and use modified B 
intakes, so you might inquire in the wanted section on the production 
racing forum.
http://www.coloradoscca.org/prodcar/index.php
John
Fogelsville, PA
Michael Cheman wrote:
> Hello - I've been watching the list for some time now and have found 
> it to be a wealth of information.  I've got a '66 Sprite with a 1275 
> and I want to put 1.5" SUs on it.  The engine has a mild cam, ported 
> head, and header.  The current 1.25" carbs seem to run out of flow top 
> end.  I've got the 1.5" SU carbs, but I'm in need of a manifold.  
> Anyone have one for sale, or know where I can locate one?  Thanks in 
> advance.
 
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