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PostPosted: Wed Aug 17, 2022 10:56 pm 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
Posts: 13008
Location: Fircrest, WA
Car Model: 76 D100
Stock 1976 motor, somewhat tired. In a full size truck with a 727 trans and 3.9 rear gears.

Never run stock Holley 2300 economaster carb with reverse idle mixture circuit.

Pump cam I believe is red.
Power valve is 10.5
Stock jets read 52 and then an upside down 2. I believe these are 52 1/2 jets.


52 jets seem awfully lean for this carb. I recall most people run roughly mid-60s sized jets in the 2300.

I am going to try running this carb stock.

Anybody have advice about what jets to start with? Or should I just go with the stock 522 jets and see what happens? I will have a wideband O2 sensor installed and functioning before the carb goes on, but I am trying to ballpark it as close as I can pre-installation.


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PostPosted: Thu Aug 18, 2022 7:18 am 
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 16447
Location: Blacksburg, VA
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My guess is the metering block is different than a standard 2300, for which those jets should not even be close to working. A standard 2300 series 500 carb should run maybe 62 jets at the minimum and more like 64-68, assuming you are anywhere near sea level.

I would try it as is and change jets from there. It is obviously set up differently inside than a std 2300 Holley 500 2bbl.

If you do not have a wideband O2 sensor, you will save yourself a ton of time and perhaps a fair bit of money by installing one now. The AEM gauges are under $200 and have everything you need and are highly durable and reliable.

Lou

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PostPosted: Thu Aug 18, 2022 9:52 am 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
Posts: 13008
Location: Fircrest, WA
Car Model: 76 D100
Thanks, Lou. I do have a wideband sensor. I just need to weld the sensor bung to the exaust pipe and drill the hiole for the sensor.

I will run it as-is first and see how it does.


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PostPosted: Thu Aug 18, 2022 9:05 pm 
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Joined: Thu Oct 17, 2002 7:27 pm
Posts: 14117
Location: Park Forest, Illinoisy
Car Model: 68 Valiant
IIRC, the extra number on the jet means it's a precision jet. They are actually flowed when made.

I could be totally full of poo too. :mrgreen:

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