LS3 crate motor leak..opinions please.

[CamaroBill]

Originally Posted by Chad-1stGen

No. At a minimum, leave the current low vacuum set up you have now in place but add another hose from the valley cover to the high vaccum port on the passenger side of the intake behind the throttle body. Since this is an LS3 you should also have a restricted orifice tube coming off the valley cover in the same area. As the LS3 valley cover tube is restricted it substitutes for an actual PCV valve. There isn't enough vacuum from your current setup to properly relieve crank case pressure.

The absolute best write up I've every seen about crankcase ventilation is here: http://www.shophemi.com/images/media..._ccv_bible.pdf

You want to at a minimum mimic the diagram on page 13. The document is long but if you take the time to read the whole thing you can setup your crank case ventilation properly.

EDIT: I'd also add a catch can between on the high vacuum "dirty" side between the valley cover and the high vacuum intake port. You don't really need a dual catch can setup on a NA LS3. I have a dual catch can setup on my 427" stroker LS3 which generates crazy amounts of windage and crancakse pressure and the "clean" side catch can has never had a drop of oil when I check it. The dirty side catches a lot of oil. The best bang for the buck catch can setup IMO is: http://www.saikoumichi.com/ There are other more blinged out ones available for more money if that is your thing.

Chad, thank you so much for taking the time to explain that, and the link to the "CCV bible " , a ton of good info there. I just bought this car and I'm trying to make sure it's squared away before I really push it. I dug into a little more and discovered that the tube from the valley cover is looped to the vacuum port behind the throttle body. Here is a picture.

[randy]

Originally Posted by CamaroBill

Chad, thank you so much for taking the time to explain that, and the link to the "CCV bible " , a ton of good info there. I just bought this car and I'm trying to make sure it's squared away before I really push it. I dug into a little more and discovered that the tube from the valley cover is looped to the vacuum port behind the throttle body. Here is a picture.

That is what i used to then run to my oil catch can. Here is my setup

[CamaroBill]

Originally Posted by randy

That is what i used to then run to my oil catch can. Here is my setup

Nice set up, added to my "to do" list.