I'm glad this one came up, as I will be grooving a '99 Olds 88 w/ the 3800 series 2 motor pretty soon. Couldnt find the PCV then looked online and found out how PCV is under that plate, w/a spring. So if you fill in lower section of PCV w/ JB and reinstall, how does the part of motor vented by PCV "breathe" ? Meaning I'm used to thinking on a v engine like this V6, one valve cover has an air inlet from filtered air to feed in fresh air so the PCV (typically on the opposite valve cover)can pass crankcase gas through to a manifold vacuum source. I dont understand the passages on the intake manifold(s) found on these Series 2 and newer GM 3800's, have not looked inside yet. If we block off the PCV valve this way, does the motor only now vent crankcase through the air inlet breather hose, or?? Thanks anyone who can answer this one! TracyG