5.7 Hemi "issues"?

My buddy has a 5.3 and he found out it's piston slap in the bore due to short skirts on the pistons...he doesn't know how much gas he has eather! I use Castrol synthetic blend 5W20. Mine Doesn't have the multi cyclender crap on it, I think that came out in '06.
I was kind of wondering about that cap setup though. The thing looks funky, But I haven't spilled a drop of oil filling it up...yet.
Most of my driving is at least 20min, by then it's up to temp. I know what you mean about that dip stick tube.