It doesn't sound like piston slap at all and did not go away when it warmed up....it seems like it got worse when it warmed up. My 5.3 has a little piston slap and goes away within just a few moments.
I am going to pull the pan tonight when I get home and see if the o ring on the pickup is cracked or broken. Sounds like it could lead to aeration on the pressure oil side.
I am really hoping that it is something simple.
Sean
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