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  7. Holley and Early Motorcraft Main Metering Jet 120-40-65
Holley and Early Motorcraft Main Metering Jet 120-40-65
Holley and Early Motorcraft Main Metering Jet 120-40-65

Holley and Early Motorcraft Main Metering Jet 120-40-65

Your Price: $5.95
1/4" x .065"
Part Number: 120-40-65
Availability: In Stock
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Holley and early Motorcraft hi-performance main metering jets.

Price is for one jet, some carburetors will require two.

SPECS:
  • Threaded end: 1/4"
  • Orifice: .065"
CARBURETORS:
  • Holley 94
  • Holley 847
  • Holley 1904
  • Holley 1920
  • Holley 1940
  • Holley 2300
  • Holley 4000
  • Holley 4150
  • Holley 4160
  • Early Motorcraft 2100
  • Early Motorcraft 4100
Does not fit the 2280, or 6280 2 barrel.
The later (after 1963) Motorcraft 2100 & 4100 use this jet.

TECHNICAL:
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.

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