wav3form

iTrader: (1)

I just picked up an old style LS6 valley cover because I didn't know there was a revised version with a built in PCV which is essentially holes in the bottom of the black box in between the knock sensor holes.

Am I giving anything up by using the old style LS6 valley? I can exchange it no problem. The only difference I know is that I still have to run an external PCV valve with the old version which doesn't bother me any.

Mumbles

iTrader: (5)

As you mentioned, the only difference is the need to run an external PCV Valve. Otherwise they perform identically.

I purposely installed the old style on my 1999 Firebird, so I could retain an external PCV Valve. Rather than risk the chance of the new style failing (which are slim to none) resulting in having to remove the Intake to install a new one.

wav3form

iTrader: (1)

Thanks. I thought there might be some other benefits but it looks like the pcv valve is the only real difference.

A.R. Shale Targa

iTrader: (2)

Apparently the new design does NOT have a pcv valve inside but rather is
called a fixed orifice restriction design so there is nothing to fail.....
both designs work well !!!!

brianw401

iTrader: (4)

[QUOTE=A.R. Shale Targa;15297911]Apparently the new design does NOT have a pcv valve inside but rather is
called a fixed orifice restriction design so there is nothing to fail.....
both designs work well !!!![/QU

I have a Z06 that had the old valley plate & it would fill the catch can with oil in no time. Once I switched to the 2004 style valley plate, it completely cured the problem. I can go months before I have to drain it. This process was done as a factory recall on early Z06 models. Use the newer style, you won't regret it. You just have to cut a chunk off the engine block for it to sit flush. It's really easy. Just make sure you cover the cam hole really good & use a shop vac as you cut.