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Old 09-17-2019, 10:15 PM   #9
40 Deluxe
Senior Member
Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,040
Default Re: 292 y-block distributor puzzler

No, the timing should NOT retard at idle with the lines connected. And, timing should advance when revving in neutral if both diaphragms are good. After all, both venturii and ported vacuum are present at a fast idle, say 15-1800. Have you checked the diaphragms for leaks? A good old-fashioned suction/tongue test is all that's needed. If you can get a good seal with a vacuum hose, just suck on the line and block with your tongue for a few seconds to see if it holds vacuum.
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