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Vehicle Info NeededHOLLEYPART NUMBER: 510-121-128
Accelerator Pump Discharge Nozzles, 0.028 in. Straight, for Model 4150 and 4160 Carburetors
$2839
1 left in stock
Ships on Sep 14, 2026
Lowest Price GuaranteeStraight Nozzles *For 4150/4160/4500 carbs
Accelerator Pump Discharge NozzlesFits Model 4150, 4160 and 4500 Carburetors 0.028 in. Hole Size, Straight Type Includes 2 Nozzles and 4 Gaskets Sold as a Pair
The Holley 121-128 is a pair of accelerator pump discharge nozzles -- also called shooters or squirters -- with a 0.028 in. straight-type hole for Model 4150, 4160, and 4500 carburetors. The nozzle hole size sets the accelerator pump discharge rate, so swapping shooters is a primary way to tune out an off-idle hesitation or bog. The set includes two nozzles and four gaskets.
Holley 121-128 Features:
- Accelerator pump discharge nozzles (shooters)
- 0.028 in. hole size, straight type
- Tunes the accelerator pump discharge rate
- Includes two nozzles and four gaskets
- Sold as a pair
Part TypeCarburetor Accelerator Pump Nozzle
BrandHOLLEY
Package Height1.2
Package Width2.2
Package Length2.8
Weight0.05 PG
Part CategoryPerformance Parts
Pump Discharge Nozzle StyleStraight-type
QuantityPair
Part FitmentUniversal
Pump Discharge Nozzle Gaskets IncludedYes
Pump Discharge Nozzle Size0.028 in (0.7 mm)
Vendor Part Number121-128
Package Qty1
Package TypeEA
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