Quote:
Originally posted by Bruce Edwards
JP,
It is my opinion that doubles are best on the track and not the street. They are over kill for most engine set ups. Think about it most folks never drive more than 75 or 80 and most of the time is spent driving around town at slow speed and low rpm. For this type of set up a vacum second is ideal. When you do want it is ready to go but only opens as fast as the engine needs it. Better fuel use and smoother change from the front to all fours.
If you are running at 120+ all the time and the carb never goes back to the front barrells use the double other wise save your money.
To me it is a no brainer. 20+ years of building cars I had to learn something!
By the way thanks for the nice words. 
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We do agree. That is exactly what I've been saying. Too much can be overkill for the type of driving that most of us do, which is what I was trying to explain in my last post.