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Old 09-26-2007, 01:45 PM
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Question what size jet in a holley

Hi , trying to find what size main jets come with a 600 , 750 holley carbs . Is there a website somewhere that has a list / size chart . Picked up a used 750 -vac secondary and i want to make sure its got the right / smallest ones in to start out with .
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Old 09-26-2007, 11:59 PM
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You need to get the "list" number off the front of the choke airhorn, without that it is all a guess.
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Old 09-27-2007, 12:57 AM
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80508
1357
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Old 09-27-2007, 11:57 PM
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www.holley.com got to the tech section, there is a list of almost all of the carbs in there that tells which jets, power valves, etc that they came with listed in order by list#. Yours is 80508. The other number is a date code.
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Old 09-28-2007, 01:37 AM
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I have a numerical listing & component parts. I show a 80508 as a 4160, 750 CFM rebuild kit 37-754/ trick kit 37-921. primary jets are shown as .072/ Power Valve 125-65. secondary spring is plain. I have found that sometimes they didn't come with these components but it will give you a starting point. Remember Holleys come out of the box set for sea level. I find jetting down 1 jet size per 2000 ft above sea level is a good rule of thumb.
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