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B20B distributor Vac advance 140-160

posted by  Zee on  Wed May 14 21:28 CST 2008
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last visit: Sat Oct 27 10:07 CST 2012
[RELATED]

1969 144s, B20B,"F" head (I think) twin SU HS6 carbs, distributor has vacuum advance.

From where does this distributor draw its vacuum?

I have the Voolvo "green book" factory manual, a Haynes, and a SU Carb manual.

None of these shows where on the intake manifold to connect the vac hose.

The green manual shows a distributor with a vac hose fold-out illustration "2-B B 20B engine (sith SU-carburettors) after page 2:58.

but there is no mention of a nipple in the listed components.

The intake manifold has large nipples for the brake boster and crankcase gas through the oil cap.

The air filter box has a large nipple for fresh air to the flame trap/oil separator, and a small nipple which is shown as the ventintg for the float bowls to the air cleaner.

No other nipples can I find on the carbs, the intake nor the air aleaaner.






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