Holley Jet Drill Size Chart

I went down three sizes of main jet and up two sizes of idle circuit air corrector as it came from Holley. The jets are actually sized by the amount of fuel they flow.

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Holley Carburetor Full Power Circuit Calibration Guide

Each and every Holley power valve features a stamped-in number that corresponds to.

Holley jet drill size chart. You cannot look at the chart and drill a jet out to a particular size and expect it to flow the same as another jet that has the same drill size. There are drill sizes listed in the Holley tech manuals but they can vary. All Holley jets are sized by actual flow and may vary from sizes above.

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. Diameter in Diameter mm 107. We had to do some last minute tuning on a Holley bugspray 94 and ended up opening up a 60 jet to a 063 drill size.

This fine tuning resulted in the 700-hp mark being surpassed. So this months Tech Series deals with Holley four barrel carb main jet sizes and the corresponding drill size. Primary Primary Secondary Primary Secondary Primary Carburetor Model CFM Renew Trick Secondary Main Main Jet Metering Metering Primary Discharge Part No.

The chart below can be used as a guide when correlating main metering jet part numbers to secondary metering plates. One of the things we noticed over the years is the lack of information concerning Holley List numbers and the specifications for individual carburetors and their stock jetting. Holley jets range in size from 40 to 99 with the stock jet size differing based on the carburetor model and engine application.

This chart dates from 1983 so when there is talk of ordering a part number it likely has been a. SECONDARY METERING PLATE PART EQUIVALENT MAIN JET PART 134-8 122-64 134-9 122-64. Jets Metering Rods Bleeds.

Holley 4 Barrel Carburater Information List Numbers and Stock Jetting. Also included is a chart for the Holley 4360 5200 and 5210 Main Jets. To get these results the 1050 Dominator calibrations were given a great deal of attention at WOT and at part throttleidle.

Kit Kit Needle Jet or Plate Block Block Power Valve Nozzle Seat Size 0-1848-1 4160 465 37-119 37-933 6-506 122-57 NS NS 34R9716-3 125-85 025. 88 89 and 90 show a104 drill size. Estimated to ship directly from the manufacturer in 24hrs.

Jet Secondary Main Jet or plate Primary Metering Block Secondary Metering Block Power Valve Pump Nozzle Size Primary Secondary Nozzle Size or Spring Color Primary Bowl Gasket Primary Metering. Holley Alcohol Jet Drill Size. Carburetor Size Selector For Model 4150 Double-Pumpers Model 4165 Spread-Bore Model 4500 Dominator More about using the chart If your car has an automatic-transmission make sure you know the converter stall speed before using the.

The differences are more than one drill size between each even tho Holley lists a drill size for each one. 37 rows PINNED HOLE SIZE inches HOLLEY JET EQUIVALENT. I hear different things about drilling jets so I d like to get the proper jet.

Jet Hole sizes provided for reference only. 80 81 and 82 all show a number093 drill size. The Holley jet sizes do not have any real corresponding hole size.

165 rows Drill size. The book is Holley carburators from SA design Dave Emanuel is the author. Holley to BLP R-Jet Conversion Table.

The entry angles on the holes the holes size itself affect this. The car runs much better so I know were in the ballpark right now. 35 016 etc I have some cb750k 1978 carbs that the slo jets are too far gonepress type and I would like to make replacements for them.

Holley Carburetor Numerical Listings Carb. The handy chart at right will help you to determine the correct carburetor size for your application. One note of caution here.

Thousandth of an inch diameter that the jet actually is for example ie. There is even an Air Bleed chart in case you want to do some tinkering there as well. Does a chart exist that crosses jet sizing size to the exact.

This is necessary when converting the secondary metering plate to a metering block with replaceable jets as with the conversion kits listed above. Holley notes that if you come up with an even number for example 16 Hg which divides to 8 and see that we do not make that specific size power valve round down to the closest size 75 in this case.