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Replacing 2.7L on 2021 Silverado with 2023 2.7L

jmajor422
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jmajor422 New Member

jmajor422

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Posted

My 2021 Silverado 2.7L (K as 8th letter in VIN) needs a new engine.

Just picked up a 2.7L engine from an auto salvage... Salvage yard is telling me this is the right engine.

Ran the VIN of new engine and found that it is a 2023 Silverado 2.7L and not a 2021 Silverado 2.7L

Is there a proven checklist of things I need to do to do the engine swap

OR

Should I just return it back to the auto salvage.

 

Looking for some real world advise besides AI... as I don't want to install an engine that will always give me a check engine light.

 

Thanks, JM

newdude Senior Enthusiast

newdude

Posted
Posted

The 2023 one would be nice to get as its got the updated block and bottom end.  Its the Turbomax spec L3B.  Same RPO code "K", GM never changed it.  

 

I see a couple issues.

 

1st issue that I see is if you got a new engine from GM, there is an updated ECM calibration required for a new crate that services 2020-2022 non Turbomax/HO engines.  What it does, I have no idea.  I do believe the new replacement engines are also of the Turbomax spec but don't change to that tune spec.  

 

2nd, 2023 is GM Global B computer platform, so if any changes were made to the connectors or sensors, those won't compute to your truck which is Global A.

 

The other thing on that 2023 is there is a ground strap that is on the 2020-2022 engine that is not present on the 2023-up engine.  

 

So ideally, you'll want the right engine to be safe.  

 

 

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jmajor422 New Member

jmajor422

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  • Author
Posted
39 minutes ago, newdude said:

The 2023 one would be nice to get as its got the updated block and bottom end.  Its the Turbomax spec L3B.  Same RPO code "K", GM never changed it.  

 

I see a couple issues.

 

1st issue that I see is if you got a new engine from GM, there is an updated ECM calibration required for a new crate that services 2020-2022 non Turbomax/HO engines.  What it does, I have no idea.  I do believe the new replacement engines are also of the Turbomax spec but don't change to that tune spec.  

 

2nd, 2023 is GM Global B computer platform, so if any changes were made to the connectors or sensors, those won't compute to your truck which is Global A.

 

The other thing on that 2023 is there is a ground strap that is on the 2020-2022 engine that is not present on the 2023-up engine.  

 

So ideally, you'll want the right engine to be safe.  

 

 

jmajor422 New Member

jmajor422

Posted
  • Author
Posted

Thanks for the reply.

I am reading other articles talking about how it will work if you reuse the ECM from the 2021.  Which I can do.  But I wont't get any of the additional torque... which I don't really care.  I just need it working.  Trying to decide if I keep the engine or if I have to return it and go find another engine?

newdude Senior Enthusiast

newdude

Posted
Posted
51 minutes ago, jmajor422 said:

Thanks for the reply.

I am reading other articles talking about how it will work if you reuse the ECM from the 2021.  Which I can do.  But I wont't get any of the additional torque... which I don't really care.  I just need it working.  Trying to decide if I keep the engine or if I have to return it and go find another engine?

 

 

If the plugs all line up, then it should be okay to go.  

  • 3 weeks later...

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