Booster Science
Fig. 3
Booster number one (straight-leg) is common to many street replacement Holleys. Booster number two (sometimes called a down-leg booster) is often used in performance-orientated carbs. Number three is a dog-leg booster with a step machined into the underside. This is a popular hop up move used by carb specialists to assist fuel atomization. Number 4 is a stepped annular discharge design while number 5 is a similar annular discharge style but without the step. The last two styles are the high-gain types most often used in big-cfm carbs.
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