Carburetors

["Stuart C. Keen, Jr." <simbafish@comcast.net>]

My 1951 MGTD Mark II has the larger 1.5 inch SU Carburetors. Does anyone
know what the SU nomenclature is for this pair of carbs? Searching the
internet, it seems it's either a H4 or HS4. What is the difference between
the two? 



Thanks for your help.

Stu Keen
Venice, FL

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