Well a few weeks ago I had my 2002 LS1 rebuilt because of piston slap. With 450 easy break in miles the slap/knock is back and worse then before the rebuild! A bunch of parts including all 8 pistons were replaced so why would this happen? It is to early to tell if the new rings stopped the oil consumption but it is slapping hard again! I have not yet told the dealer so what would you guys say I should do at this point? Thank you again for any input!