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Pro-Jection Throttle Body Injection Renew Kit for 2-Barrel Units
Product Discontinued
HOLLEYPART NUMBER: 510-503-6

Pro-Jection Throttle Body Injection Renew Kit for 2-Barrel Units

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This product is no longer available. Please call customer service for assistance at 1-800-345-4545.

Throttle Body Injection Renew Kits
Throttle Body Injection Renew Kit
  • Holley Pro-Jection 2-Barrel TBI Units
  • Rebuild and Service Components
  • Restores Fuel Metering
  • Direct Replacement Parts

    This renew kit provides the service components to rebuild a Holley Pro-Jection 2-barrel throttle body injection unit and restore proper fuel metering.

    Holley 503-6 Highlights:

    • Fits Holley Pro-Jection 2-barrel TBI units.
    • Rebuild and service components.
    • Restores fuel metering.
    • Direct replacement service parts.
    • Rebuild your Holley Carburetor!

      Rebuilding your Holley carb? With three Holley rebuild kits in countless variations, you're bound to find the correct one for your application. Within all kits are premium parts to ensure your carburetor will perfom at its best.

      Locating Holley List Numbers

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      Restore your carb’s performance and reliability with Holley Carburetor Rebuild Kits, the go-to solution for bringing worn-out fuel systems back to life. Whether you're dealing with leaks, sluggish response, or poor fuel delivery, these kits include everything you need to give your Holley carb a fresh start—gaskets, seals, needle and seat assemblies, and more, all made to Holley’s exacting standards.

      Each Holley carburetor rebuild kit is designed to match specific carb models, ensuring the perfect fit and function right out of the box. That means no guesswork, just straightforward results that get your vehicle back on the road or track with confidence. Ideal for both first-time tuners and seasoned pros, these kits help eliminate common drivability issues and extend the life of your carb.

      JEGS makes it easy to find the right Holley carb rebuild kit with application-specific options built for performance and precision. Whether you're working on a street cruiser or a full-blown race car, Holley’s proven components ensure consistent fuel delivery and throttle response after every rebuild.

      For the most accurate results, select your Holley rebuild kit by list number, ensuring compatibility with your exact carb model. This level of precision means quicker installations, better performance, and fewer headaches down the road.

      Shop Holley Carburetor Rebuild Kits at JEGS today and take the first step toward reviving your fuel system with the quality and performance Holley is known for.


    Part TypeFuel Injection Kit
    Product LineHolley Carburetor Rebuild Kits
    BrandHOLLEY
    Package Height2.0
    Package Width6.3
    Package Length6.9
    Weight0.3 PG
    Part CategoryPerformance Parts
    QuantitySold as a kit
    Part FitmentUniversal
    Vendor Part Number503-6
    Package Qty1
    Package TypeEA
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