06 6.0............7.3 is the best they ever made not sure why they would change motors......the 6.0 are good motors once you get rid of all the emissions crap that ford put on.
emissions is why they swtiched, couldnt refine the dirty 7.3 powerhouse to standards. the 04+ 6.0s were great engines along with the 6.4 and their new in-house 6.7
thought i would bump this thread up and show another set of bars i built for a friend of mine's truck. its a 03 short bed silverado. i made the steps on these a little longer than mine because his truck is taller than mine.