Do I need this?

[Mike Norris]

I am sure bigtyme1 will chime in, but the way he has the hoses setup is that the ports on the back of both valve covers are tied together with a "T" and the run to the large vacuum port (for the brake booster) on the back of the intake with no PCV valve.

This setup would put quite a bit of vacuum on the crankcase and possibly a lot of oil into the intake. He is going to check the intake and see if this is so.

I am guessing if there is a bunch of oil in there he will have to redo everything to run a PCV valve setup, but this will require a different tune to recalibrate for the less amount of air drawn into the intake.

If there is no oil, he is going to try and run a PCV valve setup anyhow and see how she runs. If it is quite bad due to the tune being done for a non PCV setup at that point, he can go back to running it the same way with the exception of just pulling vacuum from the rear of the passenger valve cover only. Now this is not right in my opinion, but it will work for what he has if it ran well before.

Hope this helps and waiting here how it works out.

The LS vacuum, PCV and breather systems are very simple for sure, but can be easily setup wrong without a proper diagram or advise.

Mike Norris