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b20b dizzy - vacuum RETARD ???? 140-160 1970

posted by  someone claiming to be shayne on  Wed Jan 22 19:01 CST 2003 [RELATED]

I've found vacuum retard to be more common. The distributor with Bosch number ending in 085 is the only vacuum advance I've seen for B18/20.

They all have centrifugal advance.

What number do you have?

As I understand it, the vacuum pulls the timing down at idle, and at (de?)
compression (when you let your foot off the throttle) to save gas.
I had mine set up this way, maybe I still do...on one of the cars, I can't remember. Anyway, it works just dandy.
You can leave it disconnected (very common) or set it up AFTER you find the timing you like.
You'll probably have to set it up with a PCV line to the manifold to get it to function.
Best,
shayne.






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