Holley 1920 Metering Jets
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. Part numbers below denote the orifice size with the third digit, 120-40-63 = .063"
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. Part numbers below denote the orifice size with the third digit, 120-40-63 = .063"
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1/4" thread Custom Assortment. You choose 8 different sizes.
Part Number 120-40A
(1)
$55.00
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1/4" x .040"
Part Number 120-40-40
$5.95
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1/4" x .041"
Part Number 120-40-41
$5.95
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1/4" x .042"
Part Number 120-40-42
$5.95
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1/4" x .043"
Part Number 120-40-43
$5.95
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1/4" x .046"
Part Number 120-40-46
$5.95
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1/4" x .044"
Part Number 120-40-44
$5.95
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1/4" x .045"
Part Number 120-40-45
(1)
$5.95
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1/4" x .047"
Part Number 120-40-47
$5.95
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1/4" x .048"
Part Number 120-40-48
(1)
$5.95
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1/4" x .049"
Part Number 120-40-49
$5.95
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1/4" x .050"
Part Number 120-40-50
$5.95
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1/4" x .051"
Part Number 120-40-51
(1)
$5.95
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1/4" x .052"
Part Number 120-40-52
(2)
$5.95
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1/4" x .053"
Part Number 120-40-53
(1)
$5.95
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1/4" x 054"
Part Number 120-40-54
(1)
$5.95
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1/4" x .055"
Part Number 120-40-55
(1)
$5.95
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1/4" x .056"
Part Number 120-40-56
(1)
$5.95
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1/4" x .057"
Part Number 120-40-57
(1)
$5.95
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1/4" x .058"
Part Number 120-40-58
(1)
$5.95
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1/4" x .059"
Part Number 120-40-59
(2)
$5.95
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1/4" x .060"
Part Number 120-40-60
$5.95
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1/4" x .061"
Part Number 120-40-61
(1)
$5.95
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1/4" x .062"
Part Number 120-40-62
(1)
$5.95
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1/4" x .063"
Part Number 120-40-63
$5.95
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1/4" x .064"
Part Number 120-40-64
$5.95
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1/4" x .065"
Part Number 120-40-65
$5.95
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1/4" x .066"
Part Number 120-40-66
$5.95
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1/4" x .067"
Part Number 120-40-67
$5.95
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1/4" x .068"
Part Number 120-40-68
$5.95
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1/4" x .069"
Part Number 120-40-69
$5.95
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1/4" x .070"
Part Number 120-40-70
$5.95
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1/4" x .071"
Part Number 120-40-71
$5.95
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1/4" x .072"
Part Number 120-40-72
$5.95
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1/4" x .073"
Part Number 120-40-73
$5.95
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1/4" x .074"
Part Number 120-40-74
$5.95
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1/4" x .075"
Part Number 120-40-75
$5.95
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1/4" x .076"
Part Number 120-40-76
$5.95
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1/4" x .077"
Part Number 120-40-77
$5.95
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1/4" x .078"
Part Number 120-40-78
$5.95
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1/4" x .079"
Part Number 120-40-79
$5.95
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1/4" x .080"
Part Number 120-40-80
$5.95
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1/4" x .081"
Part Number 120-40-81
$5.95
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1/4" x .082"
Part Number 120-40-82
$5.95
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1/4" x .083"
Part Number 120-40-83
$5.95
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1/4" x .084"
Part Number 120-40-84
$5.95
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1/4" x .085"
Part Number 120-40-85
$5.95
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1/4" x .086"
Part Number 120-40-86
$5.95
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1/4" x .087"
Part Number 120-40-87
$5.95
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1/4" x .088"
Part Number 120-40-88
$5.95
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1/4" x .089"
Part Number 120-40-89
$5.95
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1/4" x .090"
Part Number 120-40-90
$5.95
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1/4" x .091"
Part Number 120-40-91
$5.95
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1/4" x .092"
Part Number 120-40-92
$5.95
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1/4" x .093"
Part Number 120-40-93
$5.95
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1/4" x .094"
Part Number 120-40-94
$5.95
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1/4" x .095"
Part Number 120-40-95
$5.95
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1/4" x .096"
Part Number 120-40-96
$5.95
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1/4" x .097"
Part Number 120-40-97
$5.95
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1/4" x .098"
Part Number 120-40-98
$5.95
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1/4" x .099"
Part Number 120-40-99
$5.95
