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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 08-02-2002, 11:49 AM   #1
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Stock Holley 750 DP Jet size?

That's the question. I know I'm running rich, and I have jets, I just don't know which ones to put in.
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Old 08-02-2002, 01:17 PM   #2
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Holleys all came with different size jets. The only way to find out what the stock jetting on your carb is supposed to be is to get the numbers of the coke horn. If you post the numbers I will tell you what size the stock jetting was in it. Or you could start backing down two jet sizes at a time till the engine stumbles then got back up a size.
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Old 08-02-2002, 02:48 PM   #3
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Cool, I'll check it out tonight.
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Old 08-02-2002, 05:35 PM   #4
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Try 70 primary and 80 sec (without sec. power valve)
or 76 (with sec power valve)

This is normal jetting for a 750 DP carb.

Be sure your "rich mixture" is not in the idle circuit which has nothing to do with the main jets.
Check that your power valve has a vacuum rating that will alow it to remain closed at idle. (in gear).
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Old 08-03-2002, 10:42 AM   #5
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Get the Holley jet assortment kit from Summit or Jegs - about $35. It will have a pair of everything from 66 to 99 (I think that's the range, anyway). Then, when you pull the bowl off, look what's in there, get a set 2 below that (as stated above), and go from there.

The assortment kit will cost you less than buying jets in pairs by the time you find your right ratio. And, you'll never have to buy another jet.
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Old 08-05-2002, 09:12 AM   #6
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Thanks for the help. I finally bought my daily driver ('88 Turbo Coupe), so I can start tearing into the beast. I'm going to port/polish the heads since they are in desperate need of it and then see how she goes. I was runnig Friday night and the temp probably got down to high 60s F. The cooler it got the better she ran. By the time I parked it it was running 5 in. Hg. more vacuum at idle than usual. I'll have to check on that power valve vacuum thing. Also I have another question. I can't seem to get it to idle down when I have the vacuum advance on the dist. connected. It idles around 1000. The throttle screw isn't touching the linkage, and I have the idle circuit adjusted right. The linkage isn't sticking either. I was wondering if anyone else had these problems. Like I said though, I'm going to be tearing into it, so this might all go away when I put it back together. All I have to do now is shell out $90 for an electric grinder. Stupid compressor isn't big enough.
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Old 08-07-2002, 07:31 AM   #7
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Here's the numbers that were stamped on my choke air horn

4779-8

2920
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Old 08-07-2002, 06:52 PM   #8
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71 primary-80 secondary
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Old 08-07-2002, 06:52 PM
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