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Message: <blockquote data-quote="Stuster" data-source="post: 607502" data-attributes="member: 19943">Out of interest- I got the Dell 40s used and had a strip down and clean, replace seals etc. However, on the manifold for no 3 cylinder there is a vac take off for the servo brakes. I'm assuming this may well be causing the issue? If so, what is the normal route for vac take off from the brakes if you can't do this. I'm new to twin carb and trying to learn quickly!! Also, I'm assuming all the vac ports need blocking off on the carbs? What is the best starting settings for the Dells I have the Dell VW book and started with idle screws 3 turns out. What about any of the other screws?</blockquote>