I dont have the bulls eye so guess i have the ls6 wich was used in the z06 vette .its funny i can find most of the info i need at z28.com that i cant get hear ,2001 came with 10% ls6 blocks An 25% of 4th gens came with ls6 block in 2002 ,nothing else only difference is the lsl will have bulls eye left corner near the lower hose. the ls6 wont ,an the ls6 will have the # on drivers side right below the head casting #12561168 in the back of the engine ,but seems either way confirms it ,an all 2001 an 2002 ls1 engines have an ls6 instake with a smaller cam so in my case all i need are heads an a cam ,though i am sure most you all knew this already,one plus seems to be there better at high rpms,an more windows

Ok after looking up others threads that debate the bulls eye thing ,get up under the car an where the head meets the block there is the number #12561168,so i tend to think the debate is more on the side of an ls6 having no bulls eye,an not if it was made in mexico or canada as to the stamp,its near impossible to get picture of it

wish there was a away to move my garage to another forum .app for that would be nice

 

cool, some of the lt1s in some years are 4 bolt vette blocks. only way to tell for sure is take oil pan off. lol.

 

they also said another way to tell is the mexico block 1s6 was darker then the canada block they had two different ways of making them too,mine needs a good detail couse of the small power steering leak ,found most any good degreaser works great,hope to get that done in a few weeks, looks like warm up is comeing,cant stand a dirty engine,though one can get alot. cant get it all but most, i just do a hour hear then hour there till its done,then when i detail it will look better

tooth brushes an pipe cleaners lot of towals too ,work great for tight spots nearly got the one head done when looking for the bulls eye

 

So what is the difference in the block if any?
I thought the main difference was the heads and cam and maybe a bit more compression.
I also thought only the SS cars (2001-2002) got the LS6 intake.

 

only 10% stronger if that an more windows like said ,otherwise no difference though for some it seems like hitting the lotto to me its ok ,but would rather have the real deal ,it was said they ran out of ls1 blocks better flow was a thought by some ,its all over then net going for ride today no work,though gm did choose the mexico plant to to make the ls6 block over the ls1 block made in canada ,i think all cars were still assembeled in canada,there is more detailed info at other sites

but its actually been known for as many years as the piston slap has been known in ls engines as well as lsx newer engines too, it does not make guys look for the ls6 block or increace value the number in post 1 is right at driver side block meets head an trans flange better seen from under on a lift with mirror ,i guess its just the thought of haveing the block in ones car same as z06

 

I poked around and some say the LS1 block is stronger since the LS6 had material removed for the more windows,still others say there's really no difference in strength as long as it's a 2000-2002 block. The early 1997-1999 LS1's were a weaker block they say.

 

it was only 2001 10% an 2002 25% blocks were ls6 OTHER YEARS nothing to do with this . i would do more ,my search showed they chose the mexico plant couse the ls6 block was stronger ,makes sence that it should be to handle the 385hp then 405hp the next year then even more later on ,at the same time it was not alot less then !0% stonger ,but it was who has an ls6 block thread ,look on z28.com an aslo there are some ws6 cars had them too an there forums i just put in ls6 block or ls1 block


WHO HAS AN LS6 BLOCK

 

I would think the weight reduction would be more important then the strength. It is common knowledge that the LS1 block is 2-3 times stronger then the best old school small block. Even in its stock form it is reliable well into over 600 hp. Block strength is one of the main reasons the stock crank can handle the higher hp. Having a 10% strong block seems a little over kill. Unless you are building a 700hp car would it matter?

Are there really that many of us on this site that have LS1s that you are expecting a lot of "me too"s?


Just an FYI for someone else reading this, piston slap in the early LS1's was a manufacturing mistake. It had nothing to do with block strength. Piston slap occurs when the installed are a little to small for the cylinder bore. This is a mistake made several times by GM across several engine platforms including 4 cylinder and V6's. There are numerous GM tech bulletins on this for the last 30 years.

 

actaully i dont care who has one ,at this forum anything to talklng about its something,it was not that hard for me to figure out i had one after reading much different threads an posts then you others seem to be reading the 1s6 a bit stonger 10% is not that much ,an the story is the there was canada plant an mexico plant

both made ls blocks after they found that the mexico plant was makeing the bit stonger ls6 block they gm made it so canada made the 1s1 block an mexico made the ls6 block ,
what i am surprized about is this its not new information the threads go back to 2004 2008 ,

the ls6 is said to be darker then the ls1 block ,if you can find the right posts an threads retated to this ,the ls1 was lighter color block

there are many debated about wich is stonger are different ,this about 10% of 2001 4th gens haveing them an 25% of 2002 haveing ls6 blocks couse they ran out of ls1 blocks during production

Gm said the nemak mexico ls6 blocks were 10% stronger even the ls1 blockes were stronger from there ,montupet canada went on to make the ls1 blocks ,it was the different prosses in wich they were made that made either one stronger ,so mabey they are as strong from one plant to another

 

This got me researching the LS6 a little. Its basically better Heads, Cam and intake on a LS1. Its was a common upgrade to LS1's until the aftermarket started making better stuff. 400 factory HP sound nice tho Its the LS1 version of the LT4.