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Old 10-16-2010, 09:07 PM   #1
Automotive Stud
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Default Holley double pumper question

I'm rebuilding a Holley 750 double pumper but I noticed the rear power valve is plugged. Should it have a rear power valve also or leave it plugged? It's going on a street 440 with a healthy cam. Thanks
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Old 10-16-2010, 09:07 PM   #2
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Default Re: Holley double pumper question

no need for a power valve on the secondary side.
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Old 10-16-2010, 09:23 PM   #3
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Default Re: Holley double pumper question

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no need for a power valve on the secondary side.
Cool thanks
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Old 10-16-2010, 09:37 PM   #4
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Default Re: Holley double pumper question

What's the List number on the choke horn????
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Old 10-16-2010, 09:52 PM   #5
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Default Re: Holley double pumper question

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What's the List number on the choke horn????
It's 4779-6
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Old 10-16-2010, 09:55 PM   #6
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Default Re: Holley double pumper question

You can look up the original parts for the carb in the holley book

http://www.holley.com/data/TechServi...%20Listing.pdf
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Old 10-16-2010, 10:11 PM   #7
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Default Re: Holley double pumper question

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You can look up the original parts for the carb in the holley book

http://www.holley.com/data/TechServi...%20Listing.pdf
Thanks for the link! I have a book with all that but it was from 1991 and didn't have this carb in it yet. The date on it is 96.
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Old 10-16-2010, 11:23 PM   #8
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Default Re: Holley double pumper question

Here's a pic of it......
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Old 10-16-2010, 11:42 PM   #9
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Default Re: Holley double pumper question

The one pictured above shows that it has 4 corner idle mixture screws..... Does yours have that???
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Old 10-17-2010, 09:17 AM   #10
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Default Re: Holley double pumper question

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The one pictured above shows that it has 4 corner idle mixture screws..... Does yours have that???
sure does
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Old 10-17-2010, 09:43 AM   #11
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Default Re: Holley double pumper question

Being that this carb has the "down leg" venturie boosters, it's actualy a 780 cfm carb... If it had the straight boosters, it would flow around 750 cfm.....
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Old 10-18-2010, 10:31 AM   #12
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Default Re: Holley double pumper question

There is no need for a power valve in the rear but if the front has a power valve then it will have different jet sizes. PM me if you have any more questions or need any parts. I work at a high performance carb shop and can get any holly part sent to you the same day.
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Old 10-18-2010, 02:34 PM   #13
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Default Re: Holley double pumper question

Holley has a decent tech line. They were able to tell me what size jets were stock in my 600 cfm 4150 DP.
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