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07-02-2010, 08:50 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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07-02-2010, 10:14 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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