How to tell if you have the ls6 or ls1 engine block

**Ripper415** · 02-10-2007, 10:29 PM

I found this on another site and figured I'd post it here for everyones education...

(note: this has nothing to do with the ls6 INTAKE which all 01 & 02 cars have, this is specifically about the engine block).

"Apparently there have always been two version of the LS1: One built in Montupet, and one built in Nemak, Mexico. They use two different methods in creating the block, and apparently the Nemak block is a stronger, more performance oriented block. (The material properties were about 10% higher/stronger. Nemak uses a low-pressure precision fan process, more high performance oriented.). When the Z06 Corvette came out, GM decided to use the Nemak plant to build the LS6 block, since they built stronger blocks. So Nemak built LS6's, while Montupet built LS1's. Since there were so many LS6 blocks made, several made it into F-bodies. Numbers from GM are that about 10-15% of 2001 cars had LS6 blocks, and 25% of 2002 cars did. To confirm if your 2001-2002 F-body has an LS6 block, grab a mirror and a flashlight. Open the hood and head over to the driver's side to try and see the back of the left-hand deck, above the transmission flange. A cast-in #12561168 denotes the LS6 block. And if you aren't able to see the number, you may be able to tell by the block's luster-the Montupet plant cast a shinier block, the Nemak plant made the duller block. The Z06 block (LS6 block) is not only much stronger, it also has 87% better ventilation between bays, which equates to less pumping losses at high RPM's."

**99blueZ** · 02-13-2007, 12:08 AM

nice find!! Where is Montupet??

**Y2KPewterSS** · 02-13-2007, 05:17 PM

This should be a sticky, it comes up often and is useful info. Good post

**INMY01TA** · 02-13-2007, 07:47 PM

Originally Posted by Ripper415

http://www.seatstaysup.net/forums/showthread.php?t=6093&goto=newpost

The Z06 block (LS6 block) is not only much stronger, it also has 87% better ventilation between bays, which equates to less pumping losses at high RPM's."

laughible.

**1BADDLS1** · 02-14-2007, 05:50 AM

Originally Posted by Y2KPewterSS

This should be a sticky, it comes up often and is useful info. Good post

sticky sticky sticky

**Ripper415** · 02-17-2007, 10:36 PM

well i was originally just trying to help everyone out by posting this but hey i'd love to be immortalized in the sticky hall of fame

**INMY01TA** · 02-17-2007, 10:55 PM

What is so usefull about this thread?

**Tyler_LS1** · 02-17-2007, 11:30 PM

Nice to know! Great find!

**Firebirdjones** · 02-18-2007, 05:50 AM

Thanks for the info Ripper.

**stunna-shades** · 02-18-2007, 11:14 PM

you guys are late bloomers. this info has been out there for years now...and its easier to jack up the car and shine a flashlight down the trans tunnel and read the back of the cylinder head ....

and dont get all exited...i thought mine was one because i was faster then equally modded ls1's---but it kinda does feel like the lotto while your looking tho...

**1BADDLS1** · 02-19-2007, 05:41 AM

Originally Posted by stunna-shades

you guys are late bloomers. this info has been out there for years now...and its easier to jack up the car and shine a flashlight down the trans tunnel and read the back of the cylinder head

this is true but not everyone has been involved in the LS1 world since its inception so info thats come out over the years would be new to them

**ss~zoso~ss** · 02-19-2007, 07:30 AM

Originally Posted by stunna-shades

you guys are late bloomers. this info has been out there for years now...and its easier to jack up the car and shine a flashlight down the trans tunnel and read the back of the cylinder head ....

and dont get all exited...i thought mine was one because i was faster then equally modded ls1's---but it kinda does feel like the lotto while your looking tho...

chill noob, easy now

**stunna-shades** · 02-19-2007, 10:45 AM

yeah...im not knockin the guy but im just not agreeing this thread is worth all the sticky hall of fame talk.....yeah im noob to this site or am i, i could have been here in my PAST LIFE, WELL i guess that info would be very good for a non knowing 01 02 ls1 owner so CONGRATS LETS PRAISE

**ss~zoso~ss** · 02-19-2007, 01:40 PM

well sometimes things get repeated no need to make a big stink over it, if u WERE a member here you'd know this...

**stunna-shades** · 02-19-2007, 02:47 PM

previously banned...no dont ask

**ss~zoso~ss** · 02-20-2007, 11:56 AM

KAGESS?

who were ya?

**ss~zoso~ss** · 02-20-2007, 11:56 AM

do ya remember me?

**stunna-shades** · 02-20-2007, 12:06 PM

yes i remember alot of you but im a changed man now and im here mainly on helping others and getting help myself.....lets just say i use to have an ls1 camaro but now im back because i have an lt1 camaro...step down but alot cheaper so far.....