Holley Main Jets Autolite & Motorcraft Carburetors 120D40

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

19 Review(s)

Your Price: $5.95

1/4" thread

Part Number: 120-40

Availability: In Stock

Holley Jets 120-40 *

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Not everything has been replaced by computers just yet, good to have service after the sale if needed.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

Owner

Great service, price and quality, what more can you ask for! Love the Surfer Wagon tee shirt, proud to advertise for Mikes Carbs! Dick Duncan

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Reviewed by: Dick from Martinez CA on 2/5/2022

Good selection

This jet was an exact fit for my older carb. Mike's has anything needed. Great customer service as they helped me with some technical advise as well.

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Reviewed by: Jason Wallen from Greeneville on 9/28/2021

Jet

Worked like it was supposed to ,but still running rich so dropped down to .071 jets

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Reviewed by: Andrew Peck from Newton Iowa on 5/11/2021

owner

Good quality good value

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Reviewed by: Bruce A. Jackson from Vermont on 4/13/2021

Boss

Always fast and perfect

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

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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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