Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com - View Single Post - LS3: oil catch can excessive fill-up?!

TheBrightSide · 06-15-2024, 04:48 PM

So, I did my research once again, and don't know how I didn't catch it before. I did notice someone bringing up aftermarket valve covers, and it started making sense. The LS3 surely doesn't have a PCV system to begin with, and TONS of people with the LS engines and other 5.3, 6.0, and 6.2's were having excessive oil blow-by on both the automatic (AFM/DOD-equipped) and manual variant of these GM engines.

I also figured that my cheap(er) knock-off version of the Mishimoto oil catch can, probably also didn't have some sort of better filtration system. I actually don't really know if oil catch cans have check-valves or something of the sort; although I know that the high-dollar catch cans I see on Camaro5 usually do the trick, without very many issues..

I went back to the Holley aftermarket valve cover installation manual, and found part numbers for external in-line PCV valves; to which all of the parts from then were now discontinued or succeeded with newer part(s) numbers. I started looking into some universal-looking PCV valves, since I looked up that running check valves weren't going to satisfy the oil blow-by safety by much. Seems like I can simply run any in-line PCV valve with a 3/8" inlet/outlet.

Does anyone know where I should route it? I figured I could either add it somewhere in the INLET section of oil catch can hosing, which goes to the intake manifold. I thought at first to install it somewhere along the OUTLET section of the catch can routing, but wasn't too sure. I also plan on returning a generic valley cover I bought, which came with a AFM/DOD delete styled block-off valley cover, and did not have the necessary valley cover port that my OEM one does.

I don't think it would be necessary to check my engine valley cover gasket (kinda lazy and also afraid to find out). I also figured that it would've been dumb to try to plug the valley cover and try to route my outlet routing towards the driver side valve cover; which supposedly has a revised GM part number for the L99 and other LS and LS-styled V8 engines. I think I wouldn't benefit from installing the revised driver side valve cover, as I mentioned I have an LS3, and will be sticking to whatever/however my car came with.

06-15-2024, 04:48 PM	#18
TheBrightSide Drives: 2010 Chevy Camaro 2SS coupe (MT) Join Date: Jan 2024 Location: Sacramento, CA - USA Posts: 371	So, I did my research once again, and don't know how I didn't catch it before. I did notice someone bringing up aftermarket valve covers, and it started making sense. The LS3 surely doesn't have a PCV system to begin with, and TONS of people with the LS engines and other 5.3, 6.0, and 6.2's were having excessive oil blow-by on both the automatic (AFM/DOD-equipped) and manual variant of these GM engines. I also figured that my cheap(er) knock-off version of the Mishimoto oil catch can, probably also didn't have some sort of better filtration system. I actually don't really know if oil catch cans have check-valves or something of the sort; although I know that the high-dollar catch cans I see on Camaro5 usually do the trick, without very many issues.. I went back to the Holley aftermarket valve cover installation manual, and found part numbers for external in-line PCV valves; to which all of the parts from then were now discontinued or succeeded with newer part(s) numbers. I started looking into some universal-looking PCV valves, since I looked up that running check valves weren't going to satisfy the oil blow-by safety by much. Seems like I can simply run any in-line PCV valve with a 3/8" inlet/outlet. Does anyone know where I should route it? I figured I could either add it somewhere in the INLET section of oil catch can hosing, which goes to the intake manifold. I thought at first to install it somewhere along the OUTLET section of the catch can routing, but wasn't too sure. I also plan on returning a generic valley cover I bought, which came with a AFM/DOD delete styled block-off valley cover, and did not have the necessary valley cover port that my OEM one does. I don't think it would be necessary to check my engine valley cover gasket (kinda lazy and also afraid to find out). I also figured that it would've been dumb to try to plug the valley cover and try to route my outlet routing towards the driver side valve cover; which supposedly has a revised GM part number for the L99 and other LS and LS-styled V8 engines. I think I wouldn't benefit from installing the revised driver side valve cover, as I mentioned I have an LS3, and will be sticking to whatever/however my car came with.