2004 Sierra Motor Rebuild or Replace

[Norcal_04Sierra]

I have this great 2004 Sierra with a 5.3 ans 272K on it. The last probably 20K have been rough. The engine is slowly expiring.

I have had 3 mechanics (so called experts) including a local dealer tell me rebuilding is not worth it and to buy a crate motor. I hear mixed opinions the crate motors from Summit/ Jasper/ Jegs etc. that these fail soon after the warranty.  A Reman GM motor sounds like best option but the last quote from a dealer was 8K, and a local shop said 6800. Would rebuilding this motor really be more expensive? Any opinions on the crates? Trucks still runs decent. On some days it runs great. 

[sefiroxx]

Yep, 300k is the average end of life.

Try http://www.dahmerpower.com/. 100k/36 no warranty.

I have installed 2 of their rebuilds. Running 80k and 45k without a single problem.

Takes about a 3 day weekend to pull and install.

If you are going to find someone to rebuild, find a shop that the racing crowd uses