The carbs on my car were completely refurbished recently and the dizzy was also rebuilt. Since then, it's been popping a bit - not just down hills, but during low rpm steady driving. So - yesterday, I took it over to my local rolling road for a check over. He found that the .60 idle jets were all smaller which he thought was more than likely due to them being screwed in too tight and deforming the jet ends. The idle mix was set for each venturi and synced up and it's now much better.
Before:
https://www.youtube.com/watch?v=j7uI3ZjlMDs
After:
https://www.youtube.com/watch?v=tQGPfyb79ks
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