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Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

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Old 09-03-2006, 12:44 PM   #1
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How to tell the difference between 650 and 750 double pumper?

I was wondering how to tell the difference between a Holley 650 and 750 double pumper? I need a 750 double pumper and my cousin down the road has a holley carb and he's not to sure what it is. How can I differentiate the carb?

Zach
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Old 09-03-2006, 01:50 PM   #2
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(I think) There should be some numbers on or around the choke horn. Get thease numbers and do a search online.Or, If you knew what size throttle bores a 750 dp has you could flip the carb upside down and measure the diameter of the throttle plate bores with calipers. I wish I could help you more.
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Old 09-03-2006, 01:54 PM   #3
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This might help you. MorTec lists Holley carb specifications, list #'s, jetting and tuning tips.
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Old 09-03-2006, 05:55 PM   #4
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750 is a 4-corner idle carb, and a 650 is not. IIRC, that means that the 750 will have idle mixture screws on the rear metering block, and the 650 (like mine) will not.

On the choke horn, it will also have the PN that will identify the carb. 650 is 4777, and a 750 is 4779.
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Old 09-04-2006, 11:38 AM   #5
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Thanks for the replies guys. I should be able to tell now.

Zach
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Old 09-07-2006, 06:09 PM   #6
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Quote:
Originally Posted by Air_Adam View Post
750 is a 4-corner idle carb, and a 650 is not. IIRC, that means that the 750 will have idle mixture screws on the rear metering block, and the 650 (like mine) will not.
.

Old 750 DPs like 4779-2 arent 4 corner idle.
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Old 09-07-2006, 06:09 PM
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