YEARS ago, I mean like 45!!!, I remember reading an article in some Sports Car mag all about rebuilding SU carbs.
It said that SU carbs were perfect for "tinkering" because;
1) They were NEVER perfect, so it always seemed that you could improve them, and
2) You could not mess them up so badly that they failed to perform at all.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags