Holley Main Jets | Autolite & Motorcraft Carburetors

Autolite, Holley, & Motorcraft Hi Performance Metering Jets 120-40

15 Review(s)

Your Price: $5.95

1/4" thread

Part Number: 120-40

Availability: In Stock

Holley Jets 120-40 *

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Customer Reviews

Price is for one jet.
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. 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
1920
1940
2100
4000
4150
4160

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Average Customer Ratings

4.9

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hobbyist

Very nice jets. Shipped with care. Love all the supporting manuals and videos you have. Best in the business!

Did you find this helpful? 5 of 5 Found Helpful

Reviewed by: Jim Anderson from Lake Villa, IL on 6/17/2013

Great Service

Not everything has been replaced by computers just yet, good to have service after the sale if needed.

Did you find this helpful? 2 of 2 Found Helpful

Reviewed by: Ted Peterson from Waterloo on 4/23/2016

Jets

I received the carb jets. Havnt installed them yet but am pleased with being able to source these rarer jets.

Did you find this helpful? 2 of 2 Found Helpful

Reviewed by: Wes Clarke from Dawson Creek BC on 6/25/2015

Works for me

Purchased to increase primary jet size in my Autolite 4100 to accommodate ethanol fuels. Seems to be working fine. Thanks Mike!

Did you find this helpful? 1 of 1 Found Helpful

Reviewed by: Bill from Chesapeake, VA on 10/30/2015

Jets

Got a cple of the 0.04=51 jets from Mike. They came in fast, looked awesome and are performing very nicely. Nice parts! Thanks

Did you find this helpful? 1 of 1 Found Helpful

Reviewed by: Yvan Alleau from Corvallis, Oregon on 1/12/2014

Boss

Always fast and perfect

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Reviewed by: Art Jordan from Julian on 11/2/2020

Jets

Ordered these jets and some gaskets. Remarkably fast and cost effective shipping and great quality products!

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Reviewed by: Maurice Fox from Olympia, WA on 9/6/2020

carb jets

These jets are OEM quality in fit and finish. The phone staff was courteous and efficient. However, these are pricey. I bought a second set of jets from another company for half the price, and same quality. Still a good company to get parts from though, they just need to work on their shipping prices.

Did you find this helpful? 0 of 1 Found Helpful

Reviewed by: ken from pittsburgh PA on 3/26/2020

Tom Terrific

Jets just fine but too lean for my dual 4bbls, put 45s back in.

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Reviewed by: Thomas from Butte on 8/11/2019

mr.

Large selection of jets to choose from, quick delivery, and a perfect fit. Excellent source for my needs.

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Reviewed by: richard from louisville, ky on 8/22/2018

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Carburetor Parts > by Carb Types > Holley > 4150 4160 4 Barrel
Carburetor Parts > by Carb Types > Holley > 1904 1 Barrel
Carburetor Parts > by Carb Types > Holley > 94, 2100, AA-1 2 Barrel
Carburetor Parts > by Carb Types > Holley > 1940, 1945, 6145 1 Barrel
Carburetor Parts > by Carb Types > Holley > 2140, 4000 4 Barrel Parts
Carburetor Parts > by Carb Types > Holley > 847 1 Barrel
Carburetor Parts > by Part Type > Jets & Metering Rods
Carburetor Parts > by Carb Types > Ford Autolite Motorcraft > 2100 2 Barrel > Jets
Carburetor Parts > by Carb Types > Holley > 2209, 2210, 2245 2 Barrel
Carburetor Parts > by Carb Types > Holley > 1920 1 Barrel
Carburetor Parts > by Carb Types > Holley > 2300 2 Barrel
Carburetor Parts > by Carb Types > Ford Autolite Motorcraft > 1250 1 Barrel
Carburetor Parts > by Carb Types > Ford Autolite Motorcraft > 4100 4 Barrel > Metering Jets

Autolite, Holley, & Motorcraft Hi Performance Metering Jets 120-40

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