Country Boy

iTrader: (24)

I have a 01 and it is NOT a Z06 block. I have to modify the valley for the LS6 PCV system. I was looking at my girlfriends 02 SS and her block has the same identical markings as mine (see picture)

<img src="http://www.paceparts.com/extras/LS1_Z06valleys.jpg" alt=" - " />

The left is the LS1 block and the right a Z06 block, notice the red circles on the LS6 block. Mine and my GFs look like the left LS1 block.

Did they just use the LS6 block when they wanted?!

Heres the thread that got me wondering! I was doing some research on the LS6 PCV system parts and got started <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

I need some imput <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

DriveATransAm

there was a post a while back saying that there was a notch taken out a little deeper on the 01+, and that meant it had an ls6 block. near the front pas. side- right by the head. i have looked at pre 01s and they have not been cut down as much as 01+ <shrug>

Country Boy

iTrader: (24)

I know about the notch, Vince and I are discussing it on our car club's site. It on the passenger side of the block, just infront of the head. Its a little off to the left, The LS1 is a smooth flat surface and the LS^ block is a notch. You can barely make it out on the right block up in the picture (On the right deck). Im going to look at y dads 02 WS6 to see what he has <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

<small>[ December 25, 2002, 09:48 AM: Message edited by: Country Boy ]</small>

VINCE

iTrader: (1)

Merry X-Mas... In the same post you referenced in your opening.. Valvegod said....

"#12561168 was used on all 2001-2002 LS6, mid year 2001 and up LS1 cars (F&Y). I believe even the early 2001 Vettes have the LS6 style. early 2001 F bodies are running the 2000 style LS1 block #12559378 or #12560626."

Maybe you need to check your build date. Now I know you have not pulled Trish engine out of the car to verify all casting #'s on her 02..

Valvegod also said....

" #12560626 was suppose to be a change over casting, (which I beleive is made by the same casting company as the LS6 block) late 2000-early 2001 (block I think you have) (smooth no ribs in valley and no mod needed for LS6 PCV cover)and has a dark gray casting like the LS1/LS6 block #12561168."

That means to me that GM had already made the LS6 changes to the late 2000 and early 2001 shortblock, but had not changed the casting #'s to reflect that yet. If you go on to read the post John@Pace reports there are several casting #'s for a 350 shortblock Gen III LS1 engine. I do not see where John@Pace put the casting #'s for the LS6 shortblock.

If you want to argue even further. Maybe that is why we have some factory freaks out there and some cars that plain suck.. It seems it could be a toss up on what shortblock you get.. It looks to be a lot of different shortblocks circulating around..

This is a good topic Carl. I think the only people that are really worried about which shortblock they have are the ones that have slower cars.. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> When you are back up and running. I will see you out on the street for some testing and tuning.. <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />

The Dragon

iTrader: (6)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by VINCE:
<strong> . . . Maybe that is why we have some factory freaks out there and some cars that plain suck.. It seems it could be a toss up on what shortblock you get.. It looks to be a lot of different shortblocks circulating around..</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Hmm. This is most intriguing.

Before my Heads & Cam, I would Whoop up on cars MUCH stronger than mine <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Many thought I had spray.

I know I'm a very good driver . . . maybe I've got the "Block Conspiracy" thing <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Country Boy

iTrader: (24)

Your right Vince, I cant check her casting numbers, but givin all the visual things like the notch, the smooth vs bullseye type circles (in the red), it is the same block as mine. If they changed in mid 01, then why is her 02 still the LS1 block. Also, John, had a 98, but also has the intake valley of the Z06 block, why?

My car was built on the beginning of March of 01 and Tricias 02 has a build date of June (she has SS #16), so I dunno <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Im not saying that my block is inferrior, I just found it as a suprise since I have an 01 and she has a 02 and neither are the LS6 block.

About your slow comment <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> You will be faster than me, I dont have the $100000000 to change cams and do the heads all nice and puuurty <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

J-Rod

Not the same blocks. The ls6 block is sand cast. The ls1 is out of a semi-permanent mold.

The ls6 will be darker than an LS1 block because of this.

Here is an article on the differences. The Camaros did not use an LS6 block.

http://users3.ev1.net/~black_ops/z06/powerplant.pdf

<small>[ December 26, 2002, 10:14 AM: Message edited by: J-Rod ]</small>

MysticZ28

I have a late '01 - TPW mid April - and it has an '01 block. Did the LS6 valley cover upgrade, so there is no doubt, had to chisle the casting(?) boss off.

VINCE

iTrader: (1)

If I am wrong I will stand down, but at the last Corvette Shootout I was next to a Breathless Performance Z06 and we were talking engines.. One of the their mechanics were showing me the markings on the 01 Z06 shortblocks and compared them to mine on the passenger side and they were identical. The color of the shortblock was the same as well, but I saw a 02 Z06 shortblock and it was a darker color than my old shortblock.. I still think there are a bunch of different shortblocks circulating around.. I wish someone from GM would chime in and explain why?

MysticZ28

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Country Boy:
<strong>I dont even know why that part is in the valley, I see no reason for it to be there, maybe someone can enlighten me <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">My understanding, from talking with valvegod, it is an artifact from the casting process <img src="http://mysticz28.com/sigpics/dunno.gif" alt=" - " />

Country Boy

iTrader: (24)

I dont even know why that part is in the valley, I see no reason for it to be there, maybe someone can enlighten me <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

J-Rod

Look at the two blocks. Now, just look at the two valleys. You will notice the one on the left is shiny, and has casting marks on the area around the lifters. Th eone on the right is much darker, it is grayer, and the casting has a much different texture. The block was cast out of a san cast mold. The one on the left is froma semi-permanent mold. The casting technique is differnt on the two. There are obvious differences in the two. Now, if you go back and read the article that I posted a link to, it talks about this.

jerflash

i have a 2002 ws6 made in may and i think i have a ls6 block

the casting is dark gray except for the parts that are machiened and it has a notch as you can see i just want some conformation on what you guys think
<img src="http://images.cardomain.com/installs/208000-208999/208274_18_full.jpg" alt=" - " />

Country Boy

iTrader: (24)

You have the new style block, dont know about the LS6 block, but it is of the new casting. See below the machined flat surface? Its smooth and not a "bullseye" mark, its smooth and the block is dark grey and not light silver! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Lethal

This is interesting. My WS6 was built in 07/00 (it's a '01), and my block is identical to the pics shown. I still haven't looked at the block number though. Has any new light been shed on this subject?

AL SS590 M6

iTrader: (1)

Going to bring back an old thread here. I'm doing heads and cam on my 2000 Formula built in March of 2000. When I went to do the LS6 PCV mod I found that the valley in my block is the LS6 style, smooth, with no boss to cut out. Checking the casting number it's a 12560626.
What the heck is it? LS1? LS6? Or some hybrid with just the valley different?

Werx Motorsports

I have a mag article that states what the LS6 casting number was. I dont have it handy at this time but i will refference back and let you know. I own a very early production '02 and it is not an LS6 block. I checked when we did my clutch over Christmas. I dont think those numbers you posted are LS6 numbers, but its been almost 3 months since i last looked at what the number is supposed to be. I'll let you know.

99 Black Bird T/A

iTrader: (4)

Is what's on my LS6 block from Valvegod #12561168 was used on all 2001-2002 LS6.

Here are few color pics that might help a little with the color of the block.

AL SS590 M6

iTrader: (1)

But if it's not an LS6 block why does it have the LS6 style valley? Even the latest model LS1s still have the boss in the valley.

WhiteDiamond

I have seen a late 2001 F-body with the LS6 style valley(didn't need to cut the alignment boss out to put in a LS6 style PCV system) and I have seen 2002 with the boss in the valley. I think that many of us know that GM runs a huge business and they experience supply problems from time to time. It could be something as simple as that giving some LS1 F-bodies and Y-bodies the LS6 block. However, anyone who thinks their LS1 is faster or better because the LS6 block is in there needs to share the "stuff!" I would be willing to bet that LS6 blocks used in LS1 assembly lines did not get the additional bore window machining and there is nothing about the casting that would give more horsepower. The LS6 gets its horsepower from what is put IN and ON the LS6 block(specificially, cam and heads).

Todd