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Originally Posted by Anthony
Holley 4224 and 9776 are mechanical secondary carbs without a secondary accelerator pump. But, they are for a special application. I got this off of a description.
Notes: This has a mechanical secondary, but no secondary accelerator pump circuit. It is designed for a mulitiple carburetor application ONLY, it will not function properly on a single carburetor application.
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The 660s are meant for dual carb setups, but the 450 can be either dual or single.
I've been running these carbs on my brothers ProStreet Mustang for the past 5 years, and they have performed flawlessly.
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Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241