SU Carburetors application       source:  Tuning S.U. Carburetters   ISBN 85113-072-0

H designation vs. Throttle diameter (")

H1                                                  - 1 1/8                   

H2, HS2                                        - 1 1/4

H4, HD4, HS4, HS4C, HIF4      - 1 1/2

H6, HD6, HS6, HIF6                   - 1 3/4

HIF7                                               - 1 7/8

H8, HD8, HS8                              - 2

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