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Vaccum is weird to me especially after alot of upgrades, hard to tell a lot about engine health unless it just drops alot over time. When I added 850cc primaries it dropped alot, from like 17-18 to 14-15, and I know of others that have had this happen as well. And with a brand new Streetport rebuilt engine, that I know is better than the old one, only pulls about 14-15 at 1k rpms just like the old stock port I had. A compression test really the only good way to tell IMO.
I'd say the dashpot is either bad or needs adjusting, or if you have a PFC, there are some things to do. Does it do it when it cold or warm or both?
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