Sean - Big day!!
Just FYI --- a LOT of these 6.0 motors had major piston flop... when they were cold you could hear the pistons going kerflop kerflop.... once the forged pistons got some heat in them they'd quiet right down.
Not sure that's the noise you're hearing.... but it's very unnerving and GM got LOTS of complaints about it... but of course it was "normal".
Last edited by GregWeld; 07-13-2014 at 04:47 PM.
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