{
    "lazyNodes": false,
    "abFitnotesFlag": false,
    "abCrawlReviews": true,
    "productOptionsCookie": false,
    "orderDelayFlag": false,
    "skipSessionCookie": false,
    "covidMessage": false,
    "fullTitleCookie": false,
    "nrLoggerCookie": true,
    "checkoutReviewCookie": false,
    "productOptionSeqCookie": false,
    "maintenanceFlag": false,
    "bufferETACookie": false,
    "multiShippingDiscountFlag": false,
    "newFitmentFlag": false,
    "surveyOptInFlag": true,
    "crossSellFlag": false,
    "skuMappingFlag": false,
    "paySplitCookie": false,
    "callDisableFlag": true,
    "zipPaymentFlag": "c",
    "hassleFreeReturn": true,
    "lifetimeReplacement": true,
    "cpn_off": false
}
Select your vehicle
Universal Fit Add Vehicle

Holley®
550-501 Fuel Injection Kit - Polished, Universal, Kit

Tap image and pinch to zoom.
$4,999.95
$5,624.95Save: $625.00(11%)
OR
Manufacturer #550-501
Universal Fit Add Vehicle
Qty:
1

Highlights

Brand:
Notes:
Universal Retro-Fit for 4500 intakes; 4 venturi quantity
Product Fit:
Universal
Series:
HP Universal Retrofit EFI Series
Injection Style:
Throttle body
Throttle Body Mounting Flange:
4-barrel square bore
Throttle Body Finish:
Polished
Warranty:
90-day Holley limited warranty
Quantity Sold:
Kit
Prop 65 Warning:

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Color Finish:
Polished
Includes:
Fuel rails, Throttle body, ECM, and Wiring harness

Product Information

HOLLEY – HP UNIVERSAL RETROFIT EFI FUEL INJECTION KITS

Take your engine into the modern age with Holley’s HP universal retrofit EFI fuel injection kits, which are designed to convert Ford, Mopar or any V8 using a 4150 or 4500 intake manifold. With this kit, you’ll receive a programmable ECU, sensors, wiring, a throttle body, injector bungs and an un-machined fuel rail that can be modified to fit any single-plane 4-barrel intake manifold. Holley built their excellent reputation on over 100 years of experience, which is why they’re one of the leaders in fuel delivery systems and the choice of every NASCAR team for the past four decades.

  • Choose from either a 4150 or 4500 style throttle body
  • Convert most V8 intake manifolds, including Mopar and Ford, into multi-port fuel injection
  • Injector bungs and un-machined, modifiable fuel rails are included
  • Comes with an ECU, wiring, sensors and throttle body
  • You select the fuel pump and injectors to suit your engine
Need help?Call our product expert1-866-529-0412
Chat with us
Mondays - Sundays7am - 11pm ET | 4am - 8pm PT
Warranty Policy
Right parts, guaranteed. If you find any defects, let us know within 60 days and we’ll take care of it. Check out our Warranty Policy for more details.
Shipping Policy
We ship fast so you can get on the road that much faster. Check out our Shipping Policy for more details.
Easy Return Policy
We’re only happy if you’re happy. If you’re not entirely satisfied with your order, you may be entitled to a refund. Check out our Return Policy for more details.

Product Q&A

0
Product fitment says that I can use this on a Ford 300L6. Is that true? Is the fuel rail long enough for the L6? Will the ECU recognize and program properly for the L6? I would like to put this on a 1990 Ford F-250, in addition I am playing with the idea of supercharging, is this capable?NicolasMar 04, 2022
Best Answer:Hello! No, this is for V8 engines only
Mitchell D.STAFFMar 06, 2022