If anybody wants to do the ls6 pcv setup, here are some information, pictures, and tips I discovered this past weekend.

I noticed last year my stock 98 LS1 PCV system was leaking oil at the pcv valve, so I tried a vertical pcv mod last year. This helped with the oil leak, but then I discovered the oil was getting back into the intake manifold. I was aware of this after watching a video of my car running at the track and seeing black smoke coming from the exhaust. Also my car seemed to be low on oil more then usual.

This is what I found after pulling off the ls1 intake manifold. <img src="gr_images/icons/mad.gif" border="0"> Is this much oil normal? I hope not.

Oil coated intake ports on heads

The 2 different valleys.

LS6 valley and pcv setup on top, and ls1 valley on the bottom

Picture of the inadequate 1998 LS1 PCV system w/ my vertical pcv mod

I have done the ls6 pcv research, and the only thing I didn't know about was where and how much of the block needed to be trimmed. My friend and I had to cut at least 4 different times to get the ls6 valley to fit inside the ls1 block.

Trimmed the inside of the ls1 block

The only other problem we had with this mod was getting an ls1 intake manifold and the coolant tubes for the heads to work with the new pcv tube coming out of the ls6 valley. My friend got the hammer out and flatten/bend the ls1 coolant tubes some. He also shaved a part of the rib underneath the ls1 intake manifold to allow more room.

LS6 valley with original LS1 heads' coolant tubes slightly modified.

Hopefully this ls6 pcv system is better then the ls1 pcv system. <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" /> I'll find out when I swap the intake manifold in the future.

BTW, I have '01-'02 LS6 valve covers so I didn't have to worry about covering the old pcv tube sticking out of the '98 f-body valve covers.

[ March 12, 2002: Message edited by: Teddy98Z28M6 ]</p>

 

Thanks for the pictures. I was wondering how much / where to remove material from the block. I have been thinking about changing to the LS6 setup.

 

Excellent post! I'm getting ready to do mine as soon as the Magna-charger is released. Well done!
<img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />

 

Thanks, I was hoping this post would help at least one person. Even if the conversion isn't any better, doubt this though, at least there only one very short pcv pipe/tubing and not the other mess. <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />

Finished LS6 PCV pipe

 

Real nice pics Teddy! Good post!

 

VERY GOOD INFO! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

Got any part numbers needed for the swap (valve covers, valley cover,etc)? What all was needed....just the valley cover? I can dremmel that little bit off no problem <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Im gonna do this...ooooh yes. If I do an indepth writeup for this site on this topic, I'll be sure and give you credit for the help this post has given. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

My PCV system consists of the following:

I completely removed all stock PCV system components and blocked off the PCV fittings in the valve covers with JB Weld. I made some sheet metal baffles inside the valve covers and installed some fittings to attach a set of standard (1.25" hole) type "PCV breathers." The breathers are hooked up together via 5/8" heater hose to a 5/8" T-fitting, then a single 5/8" hose into my electric crankcase evacuation pump. The outlet of the pump goes into a breather tank which collects all the moisture extracted from the crankcase.

I have been unable to determine if this system helps ring seal or make additional horsepower, but it does most definately remove condensation from the crankcase, and relieve crankcase pressure. I have not been able to see how much (if any) vacuum this setup pulls at high rpm. This is a modified LT1 air pump sold by an outfit in TN that uses this setup on blown BBC powered alcohol dragsters to remove moisture from the crankcase.

Before anyone asks, no I don't have any pictures, nor can I take any since there is no motor in my car right now. I'll be switching to 99-up centerbolt heads with the new motor as well, so I no longer even have the old '98 valve covers that I installed the baffles/fittings in...

 

I have been running a LS6 pcv system as described for two years, but I am still running part of the factory LS1 system, but do not really use any oil.

http://a0.cpimg.com/image/4C/A7/6465...-028001E0-.jpg

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by jmX:
<strong>VERY GOOD INFO! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

Got any part numbers needed for the swap (valve covers, valley cover,etc)? What all was needed....just the valley cover? I can dremmel that little bit off no problem <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Im gonna do this...ooooh yes. If I do an indepth writeup for this site on this topic, I'll be sure and give you credit for the help this post has given. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Jon, Thanks for writing the heads install page is was very helpful for me last week! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

For the ls6 pcv system I had most of the parts so hopefully this list is complete.

1) The ls6 pcv tube (12568010)

2) The ls6 valley is 12568002. (This is what I have seen posted.)

3) Gasket for valley (*might be able to reuse the old gasket)

4) bolts (*should be useable)

5) Cover your old pcv tubes from the valve covers or get ls6 valve covers.

<small>[ March 17, 2002, 12:48 PM: Message edited by: Teddy98Z28M6 ]</small>

 

http://www.fbody.com/members/Teddy98Z28M6/oil_heads.JPG

That's your 98 valley?

My 98 didn't look like that. The LS6 valley cover on mine just dropped right in. No modification needed.

Hmm, wonder when GM changed engine design castings. Mid year? Mines a March/April 98.

I'll find the pictures and post them.

<small>[ April 12, 2002, 09:58 PM: Message edited by: John@PACE ]</small>

 

Teddy's 98 Engine Valley:
<img src="http://www.fbody.com/members/Teddy98Z28M6/oil_heads.JPG" alt="" />

My 98 Engine Valley:
<img src="http://www.paceparts.com/extras/valley.jpg" alt="" />

 

interesting, mine looks like the first one. so i'll have to cut to get the valley cover to work.. bummer I really dont want to chop it.

what does the bottom of the valley cover look like to need this piece 'clearanced' like that? i'd think it be flat.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by John@PACE:
<strong>http://www.fbody.com/members/Teddy98Z28M6/oil_heads.JPG

That's your 98 valley?

My 98 didn't look like that. The LS6 valley cover on mine just dropped right in. No modification needed.

Hmm, wonder when GM changed engine design castings. Mid year? Mines a March/April 98.

I'll find the pictures and post them.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yes, my Z28 was built in April 98. I didn't mind cutting the block and shaving some weight any ways. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Here's what the bottom of the LS6 intake valley looks like.

<img src="http://www.fbody.com/members/Teddy98Z28M6/DSCN0875.JPG" alt="" />

<small>[ April 21, 2002, 09:05 PM: Message edited by: Teddy98Z28M6 ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MIGHTYMOUSE:
<strong>interesting, mine looks like the first one. so i'll have to cut to get the valley cover to work.. bummer I really dont want to chop it.

what does the bottom of the valley cover look like to need this piece 'clearanced' like that? i'd think it be flat.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The red circle part is where it was hitting the block. We tried to trim it some, but it didn't help much.

<img src="http://www.fbody.com/members/Teddy98Z28M6/DSCN0876cut.JPG" alt="" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by John@PACE:
<strong>http://www.fbody.com/members/Teddy98Z28M6/oil_heads.JPG

That's your 98 valley?

My 98 didn't look like that. The LS6 valley cover on mine just dropped right in. No modification needed.

Hmm, wonder when GM changed engine design castings. Mid year? Mines a March/April 98.

I'll find the pictures and post them.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Did you buy your car used? Thats not a 98 block in your pics. Thats a ZO6 style block that was not used until 01. My buddy's 00 was not smooth inside, nor is my 00. Valvegod specifically told me that the newer block was not used until 01, and he sells used engines. Strange <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

 

MyLS1Hauls - Impossible. I've had the car since May of 98- new!!! Engine's & Heads have still never been off the car. The LS1 intake is long gone and that's why you see the LS6 crossover tube with block off's in the back. What really surprised me at first is that I don't have any casting flash in the front or back in the valley like everyone reports. GM actually hand cut it out completely on this block! My buddies 98 that was bought at the same month as mine, 10 miles apart has ribs on it too. What the... I know GM made several casting changes early on, but I don't know how they divided it by date. Valvegod?

As example, early LS1 blocks have the bolt hole locations in them for the timing chain tensioner which was originally designed but scrapped before production.

 

i take it the black thing is an oil screen/separator? what did it look like before you cut on the middle piece?

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MIGHTYMOUSE:
i take it the black thing is an oil screen/separator? YES

what did it look like before you cut on the middle piece? We only shaved on the corners since my friend thought it was hitting the bottom part. The middle opening wasn't altered much. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Here's a picture of the virgin intake valley. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

<img src="http://www.fbody.com/members/Teddy98Z28M6/ls6valley.jpg" alt="" />

<small>[ April 22, 2002, 11:10 PM: Message edited by: Teddy98Z28M6 ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by John@PACE:
<strong>Valvegod?

</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">He's a local guy around my area and he sells used LS1 parts on here and the other board. Figured you had heard of him. WOW, that is very strange. That block must have slipped into your car somehow!

Brad

 

Brad, Yes, I've heard of Valvegod. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

I simply posted Valvegod? in hopes that he would see this. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

What do you guys have for block casting #'s on those blocks? (Located on drivers side on block just below the head facing the fire wall)