Redline Your Savings - Sign-up for Email!

Make/Model Search
Make/Engine Search

Brands
Savings Central
Contact Us
Help Center

My Garage
Wish List
Order Status & Returns

Welcome
My Account

Order Status

Wish List
Savings Central
Shop by Brand
Shop Your Passion
- Shop Your Passion
- Truck / SUV
  
  Jeep®
  
  Restoration
  
  Stock Replacement
  
  Late Model Muscle
  
  Tools
  
  Gifts, Clothing, & More
  
  Circle Track
  
  Street Rod
  
  Powersports
  
  Paint & Body
  
  Marine
  
  Jr Dragster
Gift Cards
My Garage
See Our Catalogs
News & Events
Career Opportunities
Contact Us
Help Center
New Products
Shop by Make/Model
Sign In

Search Make/Model

Search Make/Engine

Sign In

Welcome
Account Dashboard
Profile
Order Status & Returns
Buy It Again
Wish List
Rewards Program
Gift Cards & Summit Bucks
Address Book
My Garage Settings
Email Preferences
Text Notifications
My Reviews
My Questions
Catalogs
Tax Exemption
Sign In

Redline Your Savings - Sign-up for Email!

Save Now on Select Restoration Parts & Supplies!

Filters

In Stock
- In Stock Items. Ships Today. (5) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- In Stock Items, Including at a Supplier. Ships In a Few Days. (5) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- All Items, Including Not In Stock (9) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Brand
- Painless Performance (4) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Holley (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Stock EFI System
- Yes (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- No (2) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
EFI System Manufacturer
- Stock (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Holley (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Fuel Injection Style
- Multi-port (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Metering Style
- Mass airflow (2) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Speed density (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Make/Model
Make/Engine
EFI System Kit Number
- HLY-550-603 (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- PRF-60217 (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Quantity
- Sold individually. (3)
- Sold as a kit. (2)
Price Range
Filter Options
- Made In USA (4)
Savings Central

Selected Filters

Filter Results by Vehicle

Loading...

Home
Air & Fuel Delivery
Fuel Injection
Fuel Injection System Wiring Harnesses
Product Results

5 Results Found For "603"

Availability

- In Stock Items. Ships Today. (5) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- In Stock Items, Including at a Supplier. Ships In a Few Days. (5) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- All Items, Including Not In Stock (9) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Filters
Brand
- Painless Performance (4) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Holley (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Stock EFI System
- Yes (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- No (2) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
EFI System Manufacturer
- Stock (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Holley (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Fuel Injection Style
- Multi-port (3) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Metering Style
- Mass airflow (2) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- Speed density (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Make/Model
Make/Engine
EFI System Kit Number
- HLY-550-603 (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- PRF-60217 (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
Quantity
- Sold individually. (3)
- Sold as a kit. (2)
Price Range
Filter Options
- Made In USA (4)

5 Results Found For "603"

Harness the power and exceptional drivability of fuel injection for your ride. Our selection of fuel injection wiring harnesses makes it easy to bring throttle body,...

Harness the power and exceptional drivability of fuel injection for your ride. Our selection of fuel injection wiring harnesses makes it easy to bring throttle body, multi-port, or sequential multi-port fuel injection to your vehicle. Whether you’re adding an aftermarket fuel injection system to your existing engine, swapping in a completely new fuel-injected engine, or just replacing old wiring, we’ve got what you need. We carry complete EFI wiring harnesses from Holley, FAST, Ron Francis Wiring, Accel, Painless Performance, and many others. Bring fuel injection to darn near anything—vintage hot rods,...

Harness the power and exceptional drivability of fuel injection for your ride. Our selection of fuel injection wiring harnesses makes it easy to bring throttle body, multi-port, or sequential multi-port fuel injection to your vehicle. Whether you’re adding an aftermarket fuel injection system to your existing engine, swapping in a completely new fuel-injected engine, or just replacing old wiring, we’ve got what you need. We carry complete EFI wiring harnesses from Holley, FAST, Ron Francis Wiring, Accel, Painless Performance, and many others. Bring fuel injection to darn near anything—vintage hot rods, street rods, replica cars, or whatever—with fuel injection system wiring harnesses from Summit Racing.

Showing In Stock Items. Show All 9 Items.

Individual Parts

Part Groups

Results 1 - 5 of 5

Painless Performance Fuel Injection Harnesses 60322

Made in the USA

Painless Performance Fuel Injection Harnesses 60322

Painless Performance Fuel Injection Harnesses 60322

Wiring Harness, Gen III Vortec, Chevy, Small Block, Each

Part Number: PRF-60322

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Painless Performance Fuel Injection Harnesses 60312

Made in the USA

Painless Performance Fuel Injection Harnesses 60312

Painless Performance Fuel Injection Harnesses 60312

Wiring Harness, Fuel Injection, Emission Harness, Multi-Port, Mass Airflow, Chevy, Pontiac, 5.7L, V8, Each

Part Number: PRF-60312

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Painless Performance Emission Device Control Harnesses 60320

Made in the USA

Painless Performance Emission Device Control Harnesses 60320

Painless Performance Emission Device Control Harnesses 60320

Emission Wiring Harness, Rear Oxygen Sensor and Fuel Tank Pressure Sensor, Each

Part Number: PRF-60320

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Painless Performance Fuel Injection Harnesses 60324

Made in the USA

Painless Performance Fuel Injection Harnesses 60324

Painless Performance Fuel Injection Harnesses 60324

Wiring Harness, Gen III Vortec, Chevy, Small Block, LS1, Each

Part Number: PRF-60324

Not Yet Reviewed

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

Holley EFI Systems Wiring Harnesses 558-103

Holley EFI Systems Wiring Harnesses 558-103

Holley EFI Systems Wiring Harnesses 558-103

Wiring Harnesses, Holley EFI, Replacement, LS Style, 58X/4X Main Harness, Speed Density, for HP, Dominator, EFI Systems Only, Chevy, 6.0-7.0L, Each

Part Number: HLY-558-103

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

...Loading

Estimated Ship Date: Today

1

Page 1 of 1

Modal Header

Contact us with questions.

Call To Order

This is a custom order part. You can order this part by Contacting Us.

Summit Racing Speedcard. Synchrony Car Care.

Summit Racing Equipment SpeedCard

Jumpstart Your Next Project!

View Details|See if you Prequalify

Stay Updated with Emails from Summit Racing

Never miss a sale on new parts, tools, and more!

= Required

First Name

Last Name

Email Address Email required

See Our Catalogs

News & Events

News & Events Home
OnAllCylinders (blog)
Calendar of Events
New Product Releases
Summit Racing News
News You Can Use
Featured Vehicles
Media Center
Sanctioning Bodies

Help

Help Center
Return Policy
Beat-A-Price Guarantee
Payment Options
Contact Us

Social

Facebook
X/Twitter
Instagram
Pinterest
YouTube
Podcast

About Summit

Corporate History
Retail Locations

My Account

Profile
Email Preferences
Order Status & Returns
Wish List
Address Book
My Reviews
My Questions
My Garage
Sign In

Career Opportunities

More

Summit Racing Credit Card
Gift Cards
Calculators & Tools
Promo Exclusions
Become an Affiliate
Summit Racing Rewards Program
Summit Racing Equipment Protection Plan

Terms of Use | Privacy and Security | Site Accessibility
Copyright 2026 by AUTOSALES, INCORPORATED
dba Summit Racing Equipment | Trademarks

Let's Build it Together^™

Modal Header