As most of you know, under certain situations the LS1 motor is prone to sucking oil through the PVC system directly into the intake manifold. This not only costs you money by having to stock up on that expensive Mobil 1 synthetic, but it also is not healthy for the LS1 to be ingesting that oil.

I have spoke with many authorities on this subject and from what information I can gather, this problem is created by having such small valve covers, that on hard cornering, oil will collect in the areas around the PVC fittings and be sucked directly into the manifold.

Similar problems have been reported on different Honda models. To address this issue, after market tuners have come out with catch-cans that install between your intake manifold and valve covers. These catch-cans do just that, they catch and retain the oil before it gets to your intake manifold.

One of these is made by Greddy, a very popular tuner for the Japanese automobile. I picked up one of these Greddy catch cans for around $100 and spent about 1 hour on the install.

Although I do not have specific step-by-step instructions here, it is a very simple install and the included pictures show you what you need to know. My C5 is a 2000 model, so anything I mention here is specific to this model, I am not familiar with the PVC setup on the 98-99 C5's and if your PVC routing/tubing is different, you would have to get creative on your installation.

By removing the female-to-female coupler, you have both a male connector on the rubber PVC hose and on the intake manifold.  This makes for a easy hook up of the clear/while hose you use to run to the catch-can.  You can see that there are two, one that connects to the black PVC male coupler and runs to the catch-can and one that runs from the catch-can and connects to the male coupler on the intake manifold. 

You will have to purchase a additional length of this clear/white tubing, the Greddy kit only comes with one piece which, surprisingly enough is actually long enough to do the job.  I grabbed another length of tube from another Greddy Catch-can kit, so I could finish this project.  You will also need an additional two hose clamps, the Greddy kit only comes with two.  In the second picture, you can see how I routed the hoses and tied them together.  The third picture shows you how I routed the hoses under the radiator cover, there is plenty of room there so you should not have to fight with anything, or take anything apart.

Removal of the catch can will be simple, take out the two bolts securing the catch-can to the shroud, loosen the two hose clamps, remove the hoses and then remove the catch can.  You also want this unit in a easily accessible area, since you are going to need to empty the oil out of this device at some point in time.  You can also see on the top of this catch-can is a L shaped fitting that has a piece of 1/4" clear tubing in it.  There is another identical L fitting at the bottom, this device is used to measure the internal oil content.  When it fills up, its time to empty the oil.

The second picture here just shows you how I routed and tied up the tubing, I chose this location since it is easy to access and there are no clearance problems with the hood that could pinch the tubing.

The last picture shows the hose as it goes under the radiator fan cover.

It is too early for me to comment on whether or not this has helped in the PVC oil consumption issue, I will give it a good test next time out on the track.