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Autolite, Holley, & Motorcraft Hi Performance Metering Jets
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Autolite, Holley, & Motorcraft Hi Performance Metering Jets

Part #: 120-40
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Holley Jets 120-40
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Description
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. Price is for one jet. The later (after 1963) Motorcraft 2100 & 4100 use this jet. Includes the Holley 2100, 2 barrel carburetor

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.

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