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Strange. RA shows EV281 for the 5.0 which is Brown in color. They show the one I got for both; 3.5Eco and 3.5 NA

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I was able to confirm that 4L5Z-6A666-AA is strictly for NA applications. If you do have this valve on your 3.5L I highly advise switching it to the brown pcv.


You can definitely blow thru both ways with the grey valve LOL.
 
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