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Holley standard main jet conversion. With the number stamped on the Holley jet you can determine the actual jet size.
Such a list would be too big on our website, so we are going to list the most popular Holley four barrel carb List #'s and their cfm size and stock jetting specifications. When you buy a used carburetor always check the jetting.
Jet # Actual Size Jet # Actual Size 80 0.090 96 0.119 81 0.092 97 0.121 82 0.093 98 0.122 83 0.096 99 0.125 84 0.097 100 0.127 85 0.098 101 0.129 86 0.099 102 0.133
Needle & Seat Primary Main Jet Secondary Main Jet or plate Primary Metering Block Secondary Metering Block Power Valve Pump Nozzle Size, Primary Secondary
Holley jets range in size from 40 to 99, with the stock jet size differing based on the carburetor model and engine application. Holley manufactures each carburetor with a set of jets that will allow the carburetor to perform well at sea level and around 70 degree air temperature.
The chart below can be used as a guide when correlating main metering jet part numbers to secondary metering plates. This is necessary when converting the secondary metering plate to a metering block, with replaceable jets, as with the conversion kits listed above.
So this month's Tech Series deals with Holley four barrel carb main jet sizes and the corresponding drill size. Also included is a chart for the Holley 4360, 5200 and 5210 Main Jets. There is even an Air Bleed chart in case you want to do some tinkering there as well.
I did a search and didn't find this info anywhere on the forum. I got the info off the. Pipemax forum. Hope someone finds it useful! http://maxracesoftware.com/bulletinboard/viewtopic.php?f=64&t=45. The creator of the chart used Plug Gage Set accurate to .0002" to measure the jet diameters.
find a chart comparing Holley jet sizes to fractional turns of the Adjust-A-Jet metering needle. These are turns open from a fully closed position. Unfortunately, we have to use an average vacuum at the venturi to develop this chart. You may find this chart slightly inaccurate in some applications. The Adjust-A-Jet ranges from the equivalent of
MaxJet Conversion Chart. MaxJets™ allow you to accurately fine tune your carburetor. These jets have 1/4"-32 UNF thread and they are offered in a wide variety of hole sizes to allow fine tuning of your specific application.