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Old 07-02-2010, 09:50 AM
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Holley Carb identification

Greetings Folks from sunny Florida,

I have a holley double pump, mechanical secondary carb with the choke horn cut off and am having a heck of a time trying to determine whether this thing is a 650 or a 750?? Anybody got any ideas since the model #'s have been removed with the choke horn? Are the venturie openings the same on the 650 & 750? What other identification distinctions can I look for?

Thanks in advance for any feedback or input dmartinsr@ispfla.com

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Old 07-02-2010, 11:14 AM
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The 650 and 750 BOTH share 1-11/16" throttle bores.

The venturi diameters is where they differ, and how you can ID the carbs.

List R4777 650 primary venturi is 1-1/4", secondary venturi is 1-5/16".

List R4779 750 primary AND secondary venturi is 1-3/8".
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