su's on a series?? yud probelly have to make yer own merryfold up fer them and go fer twin 2" bastids or 2 1/4's
 
ah had twin 2 1/2 on a 2200cc injun once so ah thought that yer bog standard 2.25 cast iron lump would be ok on 2 1/4 's
 
I think it would have been a zenith 316v rather then SU carb for a 2.25 S3. SU's and strombergs were found on the 6 pot but were put on a as mod by some owners to the 2.25 engine.
 

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