HoLLo

iTrader: (17)

My buddy just used some wire snips to chip off the ribs on the bottom of the intake..

And DEFINITELY get the 04+ LS6 Valley cover!!

R6cowboy, no LS1s in Fbodys came with the LS6 valley cover factory. The 04+ LS6 VC is the best also, due to its redesign. 01+s only have the LS6 intake, not the valley cover.

jg rider

I think you're wrong. The LS6 valley cover was on LS6 motors (Vettes, GTOs). The LS6 valley covers have 2 variations, the 04 & the 04+. The 04 has an oil separator built into it, and the 04+ has a pcv valve built into it. My pic above shows an 04+
All LS1s including the 2001+ LS6 intake manifold ones have the old style cover with nothing built into it. The pcv valve is an external piece

jg rider

Double post

jg rider

I'd like to know how you got an the LS1 coolant line to work with an 04+ LS6 valley cover. I couldn't. There wasn't enough room between the LS6 manifold, even with the ribs removed and the 04+ LS6 valley cover, because of the nubs
See my post #10 above pic

HoLLo

iTrader: (17)

Theres no 04 and 04+, it's pre year 2004 model and the year 2004 resdesigned one which was continued on LS2s, LS6s, etc for more years to follow.. They both have an oil separator but the 2004+ one works a little better by dropping oil back down into the crankcase rather than spitting it out into the PCV that is still required for the pre-2004 model..

01/02 cars come with LS6 coolant lines since they are equipped with the LS6 intake manifold..

R6cowboy

iTrader: (3)

I see, thanks for the info. I didn't know that about Fbody '01 & '02 LS1's. I know all '01+ Corvettes came with the LS6 valley cover, which in '04 they rid of the external PCV with the internal oil separator.

R6cowboy

iTrader: (3)

Hi jg rider. I don't know about the Fbody, if the 01 and 02 Fbody LS1 differed from the 01+ Corvette LS1. But ALL '01+ Vettes (LS1 and LS6) came with the LS6 valley cover, PCV system and intake. '01-'03 valley covers differed from the '04 and later valley covers. '01-'03 vented thru the valley cover (in lieu of the valve covers on '97-'00) but had an external PCV valve. '04 they rid of the external PCV valve due to the internal air/oil separator on the valley cover. And GTO's never came with the LS6 engine.

jg rider

I did mean 2004 and 2004+. Sorry for the confusion
You're right, the 2004 valley cover GM# 12568002 has an oil seperater, and an external pcv valve is still needed.
But the 2004+ unit GM# 12577927 has a built in 2.5mm orifice pcv valve instead of baffles. it doesn't need another pcv valve.
GM even sells a u shaped hose GM# 12594779 that goes from the valley cover hose fitting to the intake manifold


This is the same 2002 TSB pcv valve design that was used as a fix for oil consumption, it replaced the spring and ball pvc in trucks etc.

I thought you were saying that you knew a way to use an LS1 coolant line between an LS6 manifold and an 2004+ LS6 valley cover. Oh well, wishful thinking

jg rider

Wow! I'm not doing good today. I don't know why I wrote LS6 motors. I meant to write LS motors (Vettes, GTOs) I do Know that LS1 Camaros and TAs up to 2002 have the old style valley cover.
I'm sorry for the confusion, John

Now I'll go hide in the corner

HoLLo

iTrader: (17)

There is no 2004/2004+ model. Theres 01-03 and 04-11 They consider them pre-04 covers, and 04+ (04+ meaning 2004-2011) covers. Anything before 2004 model had the external pcv on the valley cover, anything 2004 and newer didn't.

jg rider

It seems to me you're not happy until you have the last word
01-03,04-11 who cares. I read somewhere that the improved version came out sometime in 04. The point is that there were two versions, one that had baffles but required an external pcv valve, and a newer version that had the pcv built in. That's all I've been saying

Now you can have the last word

WKF

iTrader: (1)

Here are a few comparison pics

HoLLo

iTrader: (17)

I wasn't trying to come off like that, it's sad you took it that way. My intent was to ensure any readers have the right information... I'm just trying to clarify the differences for everyone to know.. I'll be glad to have the last word, as long as things end up correct. Don't take it personal dude....

omarrakeen

iTrader: (2)

hmm theres noway id find a Z06 here. hell i never saw one before. i better stick to stock pcv. good info up there.

HoLLo

iTrader: (17)

Ordered mine new from GMPartsDirect.com for like $60.

UAE_Z28

iTrader: (14)

You are awesome!

I'll be buying with the OP so thanks for the info everyone.

Floorman279

iTrader: (11)

Maybe i missed it, but if i were running a fast 102 in my 98 ls1, which valley cover would be easiest to.install?

jg rider

Hi, they both are the same degree of difficulty or easiness.
I'm using the newer 04+ version that has the built in improved PCV valve GM# 1257927.
I'm real happy with it as it helps clean up the engine because the pcv hose from the driver's side valve cover, around the back of the motor to the pass. side valve cover, and to the pcv valve can be removed.
You'll also need a valve cover plug GM# 12568011 for where the pcv hose is removed on the driver's side vc.
And a 3/8" vacuum cap to cover the the pass. side valve cover fitting.
If you intend to run directly the the intake and the intake's vacuum fitting is in the same location as on the stock manifold, you can get this hose GM#12594779 (see above pictures)
Or you can do as I did and run in and out of a catch can





Personally, other than a neater engine I'm not seeing any improvement in blow by. I have very little of it. That's probably because my car has only 29,000 mile on it and the rings are pretty tight, so not too much combustion chamber gases are getting past them.

Oh! Almost forgot. If this is going on an LS1 motor there's a little bit of cutting to be done on the block. Nothing serious

Here's a good write up on how to do it with a 04+ cover

http://www.ls1.com/forums/showthread.php?t=145557

And an older one, using the pre 04+ cover

http://www.ls1howto.com/index.php?article=18

R6cowboy

iTrader: (3)

Good write-up jg rider ^

Floorman- I'd say 04+, theres less hoses and less of a mess to deal with. And not to mention it helps the crankcase breathe a little easier and less chance of oil consumption.

HoLLo

iTrader: (17)

Oil consumption is reduced for sure. I used to add a quart between oil changes, now my dipstick doesn't fall a drop, and it's been consistent that way for a year now.