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#1
05-25-2006, 11:54 PM
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750s and 780s....3310
Hello,
It seems the 780 and 750 share a part number. How do you tell them apart??? Didn't have this problem in the 70s.....just walked into the speed shop and bought a 780. Never heard of a Holley 750 then.....  Thank you kindly in advance... ktownkid 
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Baseball, Hot Dogs, Apple Pie and Chevrolet 
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#2
05-26-2006, 12:23 AM
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Re: 750s and 780s....3310
The newer (3310-2 on up) 750 cfm 3310 carbs use a straight leg booster which is slightly more restrictive than the earlier down leg booster from the early 3310 (3310 "EH" and 3310-1) carbs. Straight booster = 750, down leg booster = 780.
Eric
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#4
05-26-2006, 01:44 AM
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Re: 750s and 780s....3310
Not the 3310's, they're vacuum secondary. The "conventional" 750 double pumper is a list 4779.
Eric
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#5
05-26-2006, 06:08 PM
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Re: 750s and 780s....3310
Thank you for clearing that up. One last question, is there a mechanical 780??? I seem to remember one.
Thank you for the reply- ktownkid
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Baseball, Hot Dogs, Apple Pie and Chevrolet
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#6
05-26-2006, 06:16 PM
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Re: 750s and 780s....3310
I can't think of any mechanical secondary carbs that were rated at 780 cfm. Not saying one doesn't exist, just that I'm not familiar with it.
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