Basic SU Carburetter (note spelling) questions

Hi Guys,
OK, a few basic SU questions. How do you identify which type it is.
Mine have;
1) 4 studs holding it to intake manifold.
2) 3 screws holding suction chamber.
3) the numbers AUD 9 (on the outside of the body), AUD 2874 (inside the body), AUC 1332 and PDC8, PDC9 and PDC10 on the relevant pistons and AUD 9203 on the float bowl. Damper has AUC 8103 marked on it.
I believe they may be HS6, but I'm only guessing.
When they state 1 3/4" etc, where is this ACTUALLY measured?
Also have what appear to be 2 vacuum pick-offs (one is 5/16" diam and a smaller one, which I presume is for the vauum advance). Don't know what the larger one is for.
Any help appreciated. Thanks. Rod.

cd strombergs have a diagphram(ive a set of "triples"from a old 186 Xu1) .the proper SUs dont have a diagphram ..im guessing measure the 1-3/4" as the carb piston bore .. sorry i cant be of more help its been over 20years since ive worked on them ! ..but once set up correctly they are easy on the go juice

Rod
GuddayM8

I've for gotten all i wanna no about SU Carbs
RE:When they state 1 3/4" etc, where is this ACTUALLY measured?
Me thinks its the diameter of the air inlet
ButEyeDoSt&2BCorrected

su-filters.com/sucarbs.html

www.classiccarhub.co.uk/articles/perfoma...su_carburettors.html


www.teglerizer.com/suneedledb/index.html

www.teglerizer.com/sucarbs/

cya