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2004 Silverado 5.3l 4x4
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What are these plugs/vents supposed to go to? I have a few intakes and none of them are the same. The above pictured intake has a PCV vent on the top and a plug on the side. A different intake has the same PC on top plus another vent in the spot where a plug is on the one above. So where is the extra vent supposed to go to? Can I just plug it and rock and roll? It’s not the intake that came on the truck, but the one I have to use for now. The second picture is the intake I plan on using with the unknown vent in question.
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1999 Silverado ECSB 6.0
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I believe it is evap but not sure. What vehicles are these off of? I know that they are NBS trucks but what years?
 
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