Re: Engine noise
I have a 2003 1500hd with a 6.0L, and have heard from a few people that piston slap is normal on these trucks until they warm up. I haven't noticed any motor noises with my truck yet and it has 160k miles and counting. Maybe it can help better diagnose the issue.
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2003 Chevrolet CCSB 4x4 1500HD Mine
2011 Toyota Corolla S Wife's new ride
2002 Pontiac Grand Am SE2 Wrecked/Totaled 2014
1990 Chevrolet 454SS GONE 02/26/11 
1991 S10 SCSB GONE 12/24/08 
1965 Chevrolet LB GONE 06/06/05
GM for life
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