This is how I added my PCV valve in the intake so I could run no holed valve covers. Cut out a SBC chev valve cover PCV baffle: I am not using this mount pedestal so I cut it off, left 3/4 inch standing. Drill it out for the correct size for 3/8 NPT and tap it. Shape the metal on the baffle to fit between the ribs and drill small 10-32 holes. Seal the PCV baffle to intake. Thread and screw the PCV baffle to underside. Peen over sheetmetal and tack weld screws so they can never fall. Finished. The PCV valve is for newer Nissans, it is steel. The fresh air draws in from the oil fill tube on the front of the engine. Here is the tube that is in the plenum. It has a 1/8 in hole facing down just before the pinch. The tube being in the center allows to mix evenly with the fuel mixture. Just connect the nipple to the pcv with a 3/8 hose.