I just purchased a 2004 GMC Sierra that was on an insurance auction. The truck drowned during Katrina so I anticipate I will be changing the engine and transmission. I need to know if there are any significant differences between the 2002-2005 5.3 V8? Also, would it be very difficult to use a 6.0 engine? What would the change entail?

 

Starting in late 02' since some members w/ 02's have this I believe, they started using Drive by wire.
05' had the optional L33 Aluminum 5.3 H.O.

But if your just swapping blocks, you shouldn't have any issues since you'll probably reuse all your assessories and such.
For the 6.0, you'll want a 01' and newer and it will bolt in the same as a 5.3.

Oh and I have a 5.3 for sale if your interested....

 

that sound right!

 

In 02&03 the 5.3 had 285 hp and 325 ft-lbs and in 04-up they had 295 hp and 330 ft-lbs

 

How much you paid for salvage truck?

 

In 2003 the pistons came with a coating on the skirts of the pistons to try and eliminate the startup knock of the GEN 3 V8's.

A 6.0 LQ$ or LQ9 will drop right in place of any other 4.8 or 5.3.

peace
Hog

 

How much you pay for that? Curious about getting one for misc parts.

-Ron