2004 LS1 PCV system
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
2004 LS1 PCV system
I have read that '04s have the LS6 valley cover with a "restrictor" in the metal line at the front of the valley cover that serves as the PVC valve....OK,,,got that.
So my 04 Service Manual is wrong as it shows a PCV valve at a rear port at the rear of the driver's side valve cover.
On my '04 LS1, this port has a tube that has been pinched closed. Was this a service bulletin or something?
The only PCV hoses I have is one from the passenger side valve cover that goes to the throttle body and then one that comes from the front of the valley cover to the intake.
I installed a catch can, put it inline with the hose from the passenger side valve cover to the throttle body. Now I am questioning this.....was this correct?
Thanks in advance.
So my 04 Service Manual is wrong as it shows a PCV valve at a rear port at the rear of the driver's side valve cover.
On my '04 LS1, this port has a tube that has been pinched closed. Was this a service bulletin or something?
The only PCV hoses I have is one from the passenger side valve cover that goes to the throttle body and then one that comes from the front of the valley cover to the intake.
I installed a catch can, put it inline with the hose from the passenger side valve cover to the throttle body. Now I am questioning this.....was this correct?
Thanks in advance.
Instructor
Joined: Jan 2000
Posts: 231
Likes: 46
From: San Antonio TX
I have read that '04s have the LS6 valley cover with a "restrictor" in the metal line at the front of the valley cover that serves as the PVC valve....OK,,,got that.
So my 04 Service Manual is wrong as it shows a PCV valve at a rear port at the rear of the driver's side valve cover.
On my '04 LS1, this port has a tube that has been pinched closed. Was this a service bulletin or something?
The only PCV hoses I have is one from the passenger side valve cover that goes to the throttle body and then one that comes from the front of the valley cover to the intake.
I installed a catch can, put it inline with the hose from the passenger side valve cover to the throttle body. Now I am questioning this.....was this correct?
Thanks in advance.
So my 04 Service Manual is wrong as it shows a PCV valve at a rear port at the rear of the driver's side valve cover.
On my '04 LS1, this port has a tube that has been pinched closed. Was this a service bulletin or something?
The only PCV hoses I have is one from the passenger side valve cover that goes to the throttle body and then one that comes from the front of the valley cover to the intake.
I installed a catch can, put it inline with the hose from the passenger side valve cover to the throttle body. Now I am questioning this.....was this correct?
Thanks in advance.
I'm not an expert, but I don't think your catch setup is correct based on page 6 of these instructions
HTH
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
You're original configuration sounds correct. For '04, both LS1 and LS6 got the superior system with a PCV orifice in the valley cover hose fitting. The port at the rear of the driver's side valve cover should just have a plug.
I'm not an expert, but I don't think your catch setup is correct based on page 6 of these instructions
HTH
I'm not an expert, but I don't think your catch setup is correct based on page 6 of these instructions
HTH
Instructor
Joined: Jan 2000
Posts: 231
Likes: 46
From: San Antonio TX
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
That, or vent to atmosphere, as virtually every engine installed in cars, motorcycles, and most lawn mowers did until the 1960s. I have vented my built LS7 to a collector bottle for over 10 years. No more oil in the intake, and it cost about $15 worth of hoses and fittings. Plastic bottle was free......
