Originally Posted By: crainholio
The factory PCV in both my '01 LS1 and '02 4.8L truck were fixed-orifice type and have worked very well. I experimented with a Purolator check valve type on the car, and oil consumption increased significantly (1.5 qt in a HPDE track day comprised of four 30min sessions).
I'd pull the PCV valve that's on the truck and see what's there...if it's a fixed-orifice unit you just need to clean and reinstall it.
how can I tell the differernt between those 2 ? I did a search but they look the same, mabe im search wrong.