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Hello, I have a ls3 6.2 link block that I purchased that has the DOD deleted. This is my first build ever. I’m confused about my valley cover and valve cover. My valley cover has 2 openings. 1 of which has threads (1) and the other looks like a rubber hose slips on to it (2). Each valve cover also has a port on it (3,4). So, my question is, are all of these vents? What is the purpose of these. I want to run a catch can for the pcv (from 2?)
sorry if this has already been covered. Thanks for your help in advance.
In that case yes you'd cap off the intake manifild and throttle body. I ran a 3/8" hose from port on the valley cover to a small breather and tucked it away out of sight. For the valve covers I removed the 3/8" hose ends then drilled and tapped them for NPT-10AN fittings and ran the lines to a breather can.
In that case yes you'd cap off the intake manifild and throttle body. I ran a 3/8" hose from port on the valley cover to a small breather and tucked it away out of sight. For the valve covers I removed the 3/8" hose ends then drilled and tapped them for NPT-10AN fittings and ran the lines to a breather can.
If you are using a cable throttle body with vent tube, you can run a hose from the driver rear valve cover to the throttle body. You can also run from the drivers rear valve cover to the passenger rear valve cover and then from the passenger front valve cover to a catch can and from the catch can to the intake.
If you are using a cable throttle body with vent tube, you can run a hose from the driver rear valve cover to the throttle body. You can also run from the drivers rear valve cover to the passenger rear valve cover and then from the passenger front valve cover to a catch can and from the catch can to the intake.
Even so I think some of those have a PCV port too and if you want to retain PCV then you can run it as wannafbody stated utilizing a sealed ctach can or one from MMS that has an intergrated PCV valve built into the can which also has a breather on top.
If you are using a cable throttle body with vent tube, you can run a hose from the driver rear valve cover to the throttle body. You can also run from the drivers rear valve cover to the passenger rear valve cover and then from the passenger front valve cover to a catch can and from the catch can to the intake.
Originally Posted by 01CamaroSSTx
Even so I think some of those have a PCV port too and if you want to retain PCV then you can run it as wannafbody stated utilizing a sealed ctach can or one from MMS that has an intergrated PCV valve built into the can which also has a breather on top.
You can also run from the drivers rear valve cover to the passenger rear valve cover and then from the passenger front valve cover to a catch can and from the catch can to the intake.
If I run it like this a would I cap off the one on the valley cover? And then instead of running it to the intake I could just vent it to atmosphere?
or, I saw a video (pictures below) where a gentlemen ran a line from the front of the valley cover to the catch can and then what looks like from the catch can to the intake. If I decide to go that route (if it works) could I also just vent instead of going to the intake? And at that point could I just cap off the valve covers? Or would it be recommended to have a catch can for the valve covers instead?
I don't think so as I don't feel you will be using large enough lines to ventilate the crankcase. From the valley cover into the sealed can like the red one in the picture and then back to the intake manifold is a common way to address the PCV system but you would not use a breather can for this or you'll be introducing unmetered air into the engine. If you chose to go that route you could cap off the valve covers and run a breather style oil fill cap. I think what it boils down to is whether or not you want to introduce the blowby going back into the intake manifold or not, hence PCV.
Last edited by 01CamaroSSTx; May 28, 2023 at 09:00 AM.
I don't think so as I don't feel you will be using large enough lines to ventilate the crankcase. From the valley cover into the sealed can like the red one in the picture and then back to the intake manifold is a common way to address the PCV system but you would not use a breather can for this or you'll be introducing unmetered air into the engine. If you chose to go that route you could cap off the valve covers and run a breather style oil fill cap. I think what it boils down to is whether or not you want to introduce the blowby going back into the intake manifold or not, hence PCV.
I considered using the oil fill cap filter but then I heard that it makes a large mess when oil sprays. so instead of introducing unmetered air like you mentioned could I use the system like in the photo and vent the line that goes to the intake to atmosphere? And then cap off the valve covered? Definitely don’t want blowby going back into the manifold, I want it as clean as possible. Thanks for yalls patience. Trying to learn as much as possible
Ventilating to atmosphere is just that. All you're trying to do is to make certain that you can relieve the pressure inside the crankcase. Too small of lines or not enough places to ventilate would leave excessive crankcase pressure causing you to blow seals or push out the dipstick tube. This dirty side clean side stuff with PCV is nothing more than blowby gases being circulated through the engine by use of a vacuum source via the intake manifold and those byproducts of combustion get reintroduced back into the engine and eventually gum up the intake leaving oily deposits on the backside of the valves and in the intake and exhaust runners of the cylinder heads because it's designed to be a so called "cleaner way" of dealing with the results of engine combustion.
Ventilating to atmosphere is just that. All you're trying to do is to make certain that you can relieve the pressure inside the crankcase. Too small of lines or not enough places to ventilate would leave excessive crankcase pressure causing you to blow seals or push out the dipstick tube. This dirty side clean side stuff with PCV is nothing more than blowby gases being circulated through the engine by use of a vacuum source via the intake manifold and those byproducts of combustion get reintroduced back into the engine and eventually gum up the intake leaving oily deposits on the backside of the valves and in the intake and exhaust runners of the cylinder heads because it's designed to be a so called "cleaner way" of dealing with the results of engine combustion.
okay that makes sense. So what I’ll probably end up doing is running those large lines from both valve covers to a catch can and venting it to atmosphere. At that point that’ll be enough ventilation and I can cap off the valley cover?
That's correct. Just keep in mind that for a pollution controlled vehicle you may need to retain the PCV system. In other words you're required to put that stuff back into the intake manifold and there's systems out there such as ones from Mighty Mouse Solututions that will keep the PCV system entact while still doing a pretty good job of keeping that dirty stuff out of the intake manifold.
Atmospheric vents should be controlled with a pressure relief valve. Like the mighty mouse kit. Otherwise you want a sealed can that collects oil with steel wire filters and pulls air from the sealed reservoir.
Atmospheric vents should be controlled with a pressure relief valve. Like the mighty mouse kit. Otherwise you want a sealed can that collects oil with steel wire filters and pulls air from the sealed reservoir.
Not true..It does not have to be controlled. As long as your giving an engine plenty of spaces to relieve the crankcase pressure you're good to go. The only time your pulling in unmetered air into an engine is if you have a vacuum leak or your using a breather can connected to the intake manifold or not using a breather/sealed can which has a PCV valve and pressure relief valve such as the MMS can.
Last edited by 01CamaroSSTx; May 28, 2023 at 09:49 AM.
Even so I think some of those have a PCV port too and if you want to retain PCV then you can run it as wannafbody stated utilizing a sealed ctach can or one from MMS that has an intergrated PCV valve built into the can which also has a breather on top.
I stated on a thread here that the MMS catch cans acted as a PCV system and people disagreed with me. Glad to know someone else agrees with what I was told.
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Help!! Ls3 PCV DOD DELETE QUESTIONS 
