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Autolite, Holley, & Motorcraft Hi Performance Main Jet Custom Assortment
Autolite, Holley, & Motorcraft Hi Performance Main Jet Custom Assortment

Autolite, Holley, & Motorcraft Hi Performance Main Jet Custom Assortment

1 Review(s)
Your Price: $55.00
1/4" thread Custom Assortment
Part Number: 120-40A
Availability: In Stock

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Price includes 8 pairs of jets (16 total).ÿ
Holley jets. In addition to Holley, these jets can be used on some of the early Autolite 4100 carburetors as well as the early Motorcraft 2100 carburetors and the Holley 1904 1 barrel carburetors.ÿ The later (after 1963) Motorcraft 2100 & 4100 use this jet. Includes the Holley 2100, 2 barrel carburetor

Dos not fit the 2280, or 6280 2 barrel.

Threaded end: 1/4"

Don't ruin your engine. Printed specifications for jets were printed many years before the introduction of ethanol so you need to use trial & error to get the correct jet size. Test by looking at your spark plugs. Gray burning plugs are good, black is too rich, white is too lean. Change 1, or 2 jets sizes and repeat the test.

These jet sizes assume 0-5000 feet in elevation. For 5000-10000 reduce by 2, for 10000-15000 reduce by 4.

Some Holley jets were marked using 3 digits. Example 630 would equate to .063 in our list.

Also fits these Holley carburetors.
94
847
1904
1940
2100
2210
2245
4000
4150
4160

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