Question about 2005 GMC Sierra 1500 Hybrid

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Motor what's the difference between the regular motor and the vortec?

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Posted on Jul 11, 2013


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Ok I am wondering if my motor in my 91 gmc 5.7 l b8 is a vortec or a 350 it has throttle body carb and not sure thought if I could interchange it with an older 350 ..

Here, is what I think you are asking. The TBI intake from a 91 will fit the same size engine from 88 to 95. The Vortec didn't come out till 96 I believe. So if your 91 is the original engine then it is not a Vortec motor. If you want to swap your 5.7 with another 5.7 (5.7 = 350) Then the 88-95 should work, Just double check your sensors and locations as the plugs may be different and or in different locations. I know my 88 GMC and my 94 chevy (both K1500's) were a little different. Hope this helps.

Jan 17, 2015 | 1991 GMC Sierra

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Stumbles in open loop. Lack of power and hesitation

Who knows what you diidn't do right on this. Start by running a fualt code test on the OBD1 system.

Oct 09, 2012 | 1995 Chevrolet K2500

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I am swaping out 1990 4.3 chhevy sport and putting i a 1995 350 chevy

The 1995 350 is a "Vortec 5.7" motor if I remember correctly.You will have to get a throttle body and intake manifold for an older 5.7 liter(early 90's?).The Vortec engines are a sequential multiport injection setup(totally different).

May 04, 2012 | Chevrolet Chevy Cars & Trucks

1 Answer

Will a '92 4.3 Vortec motor fit in a '96 4x4 Blazer?

Yes it will bolt up but NO it won't run . The 96 has a crank sensor hole in the timing cover the 92 does not . The timing covers are not interchangeable (different bolt pattern ) . You would have to change complete wiring harness including computer all the way to the OBD diagnostic port . It will work but a LOT of work .

Mar 27, 2017 | 1996 Chevrolet Blazer

1 Answer

Truck will not start on its own, pour gas in throttle body and dies when the gas runs out. 5.7 vortec

Fuel pressure is critical for vortec motors. Most of them require a minimum of 55psi at the rail for the engine to start properly. I worked at a GM dealer and I remember it being a common problem. Change your filter on a regular basis. If the fuel pressure checks out then either the injector is bad or there is no injector pulse. Use a noid light or a high impedance test light to check for pulse.

May 12, 2011 | Chevrolet 1500 Cars & Trucks

1 Answer

What year motors, can I use to replace my blown 1996 305 vortec? I own a 1996 GMC 1500, sl, ext. cab. Does it have to be a vortec for my current computer to work properly? Will engine mounts, bell housing,...

You can use any 305 motor. Like you said you will have to exchange parts from your old motor to the new one. Just make sure you don't go to far back, because the old 305's don't have the injector ports. Then you would have to replace the heads also.

Jan 23, 2011 | GMC Sierra 1500 Cars & Trucks

1 Answer

What year motors, can I use to replace my blown 1996 305 vortec t.b.i.? I own a 1996 GMC 1500, sl, ext. cab. Does it have to be a vortec for my current computer to work properly? Will engine mounts, bell...

Yes any TBI motor will work, You do have to switch your sensors, possibly motor mounts and balancer from the old motor. all other items should transfer.

Jan 22, 2011 | 2006 GMC Sierra

1 Answer

Air cond on 2002 trailblazer

This has been a regular problem on the 4.2 vortec motor. Usually the Throttle Body has to be cleaned. Even with as many as 30K miles. Easy process.. When you do this you must unhook the neg battery cable to reset the PCM. They make a throttle body cleaner (different than Carb/choke cleaner). You can get it at any parts outlet. has a article describing the whole process step by step. Takes about 30 minutes. Do a search in the article section under throttle body cleaning

Mar 03, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Will the computer for the 305 vortec work for 350 vortec motor

No. Same Computer, different programming.


Nov 13, 2008 | 1991 GMC K1500

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