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Vehicle Info NeededHOLLEYPART NUMBER: 510-121-142
121-142 Straight Nozzle Hole size .042"
$2742
6 left in stock
Ships Today
Lowest Price GuaranteeStraight Nozzles *For 4150/4160/4500 carbs
- Straight Nozzle
- Hole size .042''
- Hollow nozzle screw included
- Includes 2 Gaskets
A wide selection of discharge nozzle sizes is invaluable to properly tune an accelerator pump system. The hole size determines the rate of discharge. A larger hole will shoot fuel at a faster rate with less pressure than a smaller hole. Nozzle sizes are stamped on each shooter (for example, a 31 stamp indicates a hole size of .031''). Two gaskets included unless otherwise noted
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Fine-tune your engine’s throttle response with Holley Accelerator Pump Discharge Nozzles, designed to deliver precise fuel bursts when you hit the gas. Whether you're upgrading your street machine or dialing in a race-ready setup, these nozzles play a critical role in eliminating hesitation and improving off-the-line acceleration. Built to Holley’s exacting standards, these discharge nozzles provide consistent fuel delivery during throttle transitions, ensuring smoother operation and stronger performance. Available in a variety of Holley accelerator pump nozzle sizes, they let you match fuel output to your specific carburetor and engine combination. This means less bog, better launches, and a more responsive driving experience overall. Perfect for tuning your Holley carburetor, these nozzles are engineered to fit securely and resist clogging or fuel disruption. They’re a must-have for enthusiasts who want maximum control over low-RPM performance and drivability. If you're experimenting with different Holley carb squirter sizes, these nozzles allow for easy swaps to help you find the perfect setup for your ride. Whether you’re chasing quicker ETs or just want your street car to respond better under acceleration, a properly matched Holley accelerator pump nozzle can make all the difference. At JEGS, we offer a full range of sizes and expert support to help you tune with confidence. Explore our selection of Holley accelerator pump discharge nozzles today and unlock sharper throttle response with every hit of the pedal.Part TypeCarburetor Accelerator Pump Nozzle
Product LineHolley Accelerator Pump Discharge Nozzles
BrandHOLLEY
Package Height1.0
Package Width3.5
Package Length5.0
Weight0.1 PG
Part CategoryPerformance Parts
Pump Discharge Nozzle StyleStraight-type
QuantitySold as a pair
Pump Discharge Nozzle Gaskets IncludedYes
Part FitmentUniversal
Pump Discharge Nozzle Size0.042 in (1.1 mm)
Vendor Part Number121-142
Package Qty1
Package TypeEA
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