5.7 in a 5.0 truck?

cookjr1 · 01-08-2007, 09:50 AM

Hey folks. I just bought a '98 GMC C1500. The truck was originally had a 5.0 vortec. The guy I bought it from replaced the 5.0 with a 5.7 long block. The original 5.0 computer and intake are running the new 5.7. Is this kosher? He said the mechanic claimed the controls are the same for the two motors, but I am skeptical. The truck runs okay at low rpm's but starves for air, fuel, or both at the top.

I feel confident the truck at least needs a 5.7 computer. Anybody reckon the intake-fuel injector system is the same, or does that need swapping also? Anything else that needs converting?

mrjohnwayne · 01-08-2007, 11:58 AM

I would think they would be different injectors but not sure. If you are intersted I have a computer and intake from a 96 vortec 5.7.

Chevy808 · 01-08-2007, 12:29 PM

Quote:

Originally Posted by cookjr1

Hey folks. I just bought a '98 GMC C1500. The truck was originally had a 5.0 vortec. The guy I bought it from replaced the 5.0 with a 5.7 long block. The original 5.0 computer and intake are running the new 5.7. Is this kosher? He said the mechanic claimed the controls are the same for the two motors, but I am skeptical. The truck runs okay at low rpm's but starves for air, fuel, or both at the top.

I feel confident the truck at least needs a 5.7 computer. Anybody reckon the intake-fuel injector system is the same, or does that need swapping also? Anything else that needs converting?

You need the 5.7 ECM. Starving at WOT only right? Regular driving you're okay. It's the same but the calibration is different with a 5.0 ECM and a 5.7 ECM.

gmctrucks · 01-22-2007, 11:33 PM

Go with mrjohnwaynes offer im sure he will give you a good deal we all need to look out for each other that's cool of you mrjohnwayne. My hat comes off for him.

01-08-2007, 09:50 AM	#1
cookjr1 Junior Member Join Date: Jan 2007 Location: Southeast Alabama Posts: 1	5.7 in a 5.0 truck? Hey folks. I just bought a '98 GMC C1500. The truck was originally had a 5.0 vortec. The guy I bought it from replaced the 5.0 with a 5.7 long block. The original 5.0 computer and intake are running the new 5.7. Is this kosher? He said the mechanic claimed the controls are the same for the two motors, but I am skeptical. The truck runs okay at low rpm's but starves for air, fuel, or both at the top. I feel confident the truck at least needs a 5.7 computer. Anybody reckon the intake-fuel injector system is the same, or does that need swapping also? Anything else that needs converting?

01-08-2007, 11:58 AM	#2
mrjohnwayne Senior Moderator Join Date: Apr 2005 Location: Texas Posts: 3,789	I would think they would be different injectors but not sure. If you are intersted I have a computer and intake from a 96 vortec 5.7. __________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4

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01-22-2007, 11:33 PM	#4
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,645	Go with mrjohnwaynes offer im sure he will give you a good deal we all need to look out for each other that's cool of you mrjohnwayne. My hat comes off for him.