Jason,
without getting into a physics lesson, the spacers help increase the velocity or speed of the air flowing through the carb, but this is hard to judge how much effect it has, especially if it's thickness is under a inch.
The biggest help is dealing with the heat, I use the one like the boss 302 came with it is a composite type material and helps stop some of the heat transferring into the carb which helps it perform better.
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69 393W Sportsroof deluxe
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