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07-09-2015, 10:55 AM
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Registered User
Join Date: Jul 2015
Location: Houston, Texas
Posts: 2
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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?
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| 1999 silverado, 5.7l vortec, 7.4l vortec |
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