V8 swap doable?

[DFILED1]

I currently have the 4.3 v6 and want to swap a 5.3 or 6.0 into my truck.. what problems am I going to run into? the truck is a 2004 gmc sierra.

[jamz]

Have you checked the patterns to see if it will mount up? If not, engine mounts would be the first .. when we did the swap in my car that was the first of many things. I'm not the gear head around here so lets get someone else to chime in .. anyone have suggestions?

[jeremy96gase]

Hi DFILED1,
Welcome to the board.

Putting a 5.3L or 6.0L in your truck should be fairly strait forward because these where optional engines on that year Sierra/Silverado. Further more the 4.3L is a V6 version of a 5.7L V8, so it's basically the same shape (just shorter) than the rest of the Small block family.

You might want to go down to a Local Chevy or GMC dealer and see if they can tell you what parts are different. (it might be short list).

Motor mounts might be different, but might be the same.
Transmission should hook right up.
You will need the new ECU that matches the new engine. There will likely be some extra wiring involved.

[Black-Label]

Actually the 4.3 motor is the same displacement as the older 262 small block V8 that came in the early 80's Oldsmobile Cutlass and Monte's, ahhh good ol G bodies. However I think the 4.3 is a much better as a V6. Anyhow the swap isn't to complicated and you can find some helpful parts for the swap at www.advanceadapters.com . As Jeremy stated though you'll definately want to aquire the ECM and wire harness for either the 5.3 or the 6.0. Good luck let us know how it goes.

[DFILED1]

thanks for the info fellas.. ill keep you posted as to how it goes.

[silvyman]

what about the 4.8 liter can it mount to the manual transmission?

[jamz]

Originally Posted by DFILED1

thanks for the info fellas.. ill keep you posted as to how it goes.

Any progress on this ?