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Old 03-15-2013, 05:10 PM   #1
truckster
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5.7 Vortec Install Questions

I picked up a 97 5.7 Vortec today for my Blazer, and I've got some questions.

How complicated is the wiring and ECM? Would I need to have the ECM flashed, and do I really need to run 4 O2 sensors? What about VSS?

I'm thinking about buying a manifold and putting my Quadrajet and HEI on it to make it simpler.

Any thoughts?
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Old 03-15-2013, 09:43 PM   #2
hugger6933
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Re: 5.7 Vortec Install Questions

It certainly would be the most cost effective route to take to put your carb and HEI on the vortec motor. You will be amazed at the power it will have as well. It will cost a good amount to go with a EFI setup and you will need a tank or a pump to pump the high pressures needed for the engine to run as well as other expensive things that you don't already have. check with some of the LS conversion guys and see what they are spending, it will cost you close to the same money. The lone exceptions will be that the motor mounts will already work and a few of the traditional 350 v-8 things like that
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Old 03-15-2013, 10:21 PM   #3
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Re: 5.7 Vortec Install Questions

I ordered a carb manifold for the vortec and I'm going to use my Quadrajet and HEI. Do you know if I need to change the balancer ao I can time it?

I'm looking forward to the extra hp and torque. I hope to get it running next week.
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Old 03-15-2013, 11:17 PM   #4
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Re: 5.7 Vortec Install Questions

Are you using the serpentine belt set-up? If not you'll need to change the water pump. Chevy used a reverse rotation water pump on the late 90's Vortec small blocks.
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Old 03-15-2013, 11:24 PM   #5
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Re: 5.7 Vortec Install Questions

I run 355 Vortec in mine now. I would say go with the HEI distriputor and carb. You are going to have to buy a vortec intake for carb. Plus not only is it a cheaper way to do the swap, you can do a little more hops with the motor that a computer wont allow...(meaning a heavier cam for a good lobe)
As mentioned by another in the post, depending on v-belt or serp setup is going to determine which water pump you will use.
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Old 03-16-2013, 12:06 AM   #6
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Re: 5.7 Vortec Install Questions

Buckskin where did you get the motor brackets for the alt..p/s pump from?
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Old 03-16-2013, 12:27 AM   #7
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Re: 5.7 Vortec Install Questions

I was planning on using the serpentine belt and accessories from the Vortec.

Is it going to be possible to time the distributor with the stock balancer?
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