4.3 engine replacement

[Hch10111989]

Will the 4.3 from a 2019 Silverado fit a 2015 Silverado? I’m told it won’t fit. Not sure why. I know it Is missing the vacuum pump. Does anyone know of any other reasons it will not fit? Any help would be greatly appreciated. 

[CamGTP]

The long block itself will fit if both are just regular AFM engines. Likely the difference is the high pressure fuel pump like on the V8 trucks.

 

If you swap that over from your 2015 and the fuel pressure sensor, it should all work.

Edited April 12, 2024 by CamGTP

[rlcole321]

I think there was a big change in AFM control from 2018 to 2019, so look into that, may have to swap some parts around.

[newdude]

It won't be a 100% direct bolt in, not without swapping some parts.

 

The water pump is totally different on the 19-21 LV3 4.3 and you'd have to swap yours over. 

 

Second, you will have to swap over your valve lifter oil manifold assembly as the connector is different on the 19-21 vs 14-18.  This will require new intake gaskets and both high pressure fuel pump lines. 

 

You will also have to swap your high pressure fuel pump over.

 

Might be some sensors here and there too you might have to swap.  

 

Oh, and no vacuum pump boss so you'd have to figure out the vacuum lines for the booster.  

Edited April 16, 2024 by newdude

[newdude]

29 minutes ago, rlcole321 said:

I think there was a big change in AFM control from 2018 to 2019, so look into that, may have to swap some parts around.

 

 

V8s had the big AFM (and introduction of DFM) changes.  4.3 still uses the VLOM setup from 14-18 but the connector is different.