2000 Chevrolet Malibu 3.1L Engine Knock

I have a Malibu with what sounds like the famous piston slap, however it doesnt go away. I replaced the lifters because I had to replace a leaking intake gasket anyway. It has new plugs and wires and has always made the sound even before replacing them. It sounds like it's coming from the top of the engine however I am open to any and all diagnostics. Please leave a comment. Thanks

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