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02-16-2006, 05:26 PM | #1 |
Conservative Individualist
Join Date: May 1997
Location: Wherever I need to be
Posts: 7,487
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Re: how do i tell how many CFM my carb is
Unless you are running a big-block race engine, vacuum secondaries (using engine vacuum to pull the secondary throttle plate open) are the best way to go - which is why most aftermarket 'street' carbs are equipped with them. They are more practical for the street. However, 'bigger' carbs (750, 850 CFM) intended for big-block engines and/or race applications (usually with very high-lift cams) can be bought with mechanical secondaries if you need them.
Holley sells a secondary diaphragm spring kit that allows you to adjust the secondary opening rate, if you wish. In fact, Holley sells just about every part of their carbs except the body, a la carte. Again, check the Holley website for details.
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5.0 Mustang Owner 1990 - 2005 |
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