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05-22-2018, 04:17 AM
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#1 |
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Registered User
 
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,829
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Re: carb tuning question
I'd say we first need to know the model number of the carb you are dealing with.
Is this an original out of the box carb or is it an older carb that possibly someone mixed and matched parts on? Yes the highest vacuum reading you can get is normally what you want that and a steady vacuum reading. Normally secondaries don't have an idle mixture system in them. In the past I have mixed and matched Holley parts to build a carb that didn't exist But I don't know if a primary metering block can be put on the secondary side.
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Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around. |
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05-22-2018, 09:02 PM
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#2 |
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Registered User
Join Date: Jun 2017
Location: upper midwest
Posts: 1,129
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Re: carb tuning question
Some Holley carbs have reverse idle mixture screws, the “list” number off the choke air horn will identify what carb you have. Unless you are running a big cam, the carb jetting should be close right out of the box.
I like to set for peak vacuum then lean it out until it just begins to lose rpms.Reset the curb idle and tweak it again. |
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