|
07-09-2015, 10:55 AM
|
#1 |
|
Registered User
Join Date: Jul 2015
Location: Houston, Texas
Posts: 2
|
5.7L to 7.4L Swap
I have a 99 C1500 with the 5.7L Vortec. I am swapping to the 7.4L Vortec. The 5.7L has a spider injector with 1 plug to the intake but the 7.4L has individual injectors. Do I need the change the entire engine wiring harness or just the lead to the intake and the ECU?
|
|
|
|
07-10-2015, 10:05 PM
|
#2 |
|
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
|
Re: 5.7L to 7.4L Swap
The Harness Routing between the two are pretty far off.
A 454 harness out of a similar ('96-'00) truck would be best, Will need minor changes If your still running a 4L60E. Though I would swap in a 4L80E at the same time. |
|
|
|
 |
| Bookmarks |
| Tags |
| 1999 silverado, 5.7l vortec, 7.4l vortec |
|
|
Linear Mode
