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Old Sep 13, 2006 | 04:40 PM
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Obelix G.'s Avatar
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Default Identify LS6 engine

I have a long block which is supposed to be an LS6, though I would like to know for sure if I do have an LS6. The exhaust manifolds do look like the z06 manifolds versus the regular c5 manifolds. The funny thing is, this engine came out of a convertible. :\ I am hoping someone swapped an Ls6 in...

How can I verify the internals are of an Ls6. I understand about the block and heads, however, the heads could be put on an ls1, and some ls1 engines shared the ls6 block.

Thanks
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Old Sep 13, 2006 | 05:02 PM
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block casting number. name it!
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Old Sep 13, 2006 | 07:44 PM
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Look on the rear of the block right under the driver's side head, there will be a casting number.

If you have ls6 heads they will have a 243 casting number on the corber of the head. If you have 241, theyre just ls1 heads.
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Old Sep 13, 2006 | 10:34 PM
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Are we talking about the 12561168 casting number? I don't see how that would help me since some "Ls1" cars used surplus "Ls6" blocks. I am just trying to rule out someone putting Ls6 exhaust and heads on an LS1 block.
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Old Sep 14, 2006 | 07:51 AM
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Originally Posted by Obelix G.
Are we talking about the 12561168 casting number? I don't see how that would help me since some "Ls1" cars used surplus "Ls6" blocks. I am just trying to rule out someone putting Ls6 exhaust and heads on an LS1 block.
What would really be the advantage of it being an LS6 block though?

LS1/LS6 is 5.7L 346 c.i.

Same thing.
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Old Sep 14, 2006 | 03:47 PM
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There are several internal advantages...

Example: The LS1 pistons are made of a metal listed as "M124" - the LS6 pistons being "M142" which has a higher nickel and copper content. The LS6/m142 pistons are stronger and expand less under high temperatures, thus allowing them to reduce the bore clearance. Reducing oil consumption and increasing overall and high rpm durability. This information was taken from "How to build High-Performance LS1/LS6 V-8's" by Will Handzel. Incredible referense book for anyone who wants to know more about our motors...

It also lists the LS1/6 block number being #12561168 from 99-02. Not sure if there is an LS6 specific casting #. Apparently 01-02 LS1 blocks were almost Identical to LS6's. Hope this helps atleast a little.

Rick M.
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Old Sep 14, 2006 | 03:52 PM
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Originally Posted by Camaro Rick
There are several internal advantages...

Example: The LS1 pistons are made of a metal listed as "M124" - the LS6 pistons being "M142" which has a higher nickel and copper content. The LS6/m142 pistons are stronger and expand less under high temperatures, thus allowing them to reduce the bore clearance. Reducing oil consumption and increasing overall and high rpm durability. This information was taken from "How to build High-Performance LS1/LS6 V-8's" by Will Handzel. Incredible referense book for anyone who wants to know more about our motors...

It also lists the LS1/6 block number being #12561168 from 99-02. Not sure if there is an LS6 specific casting #. Apparently 01-02 LS1 blocks were almost Identical to LS6's. Hope this helps atleast a little.

Rick M.
Yeah but if the LS6 block came out of an f-body then it would have the LS1 pistons right?
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Old Sep 14, 2006 | 04:03 PM
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. Id say because Ls6 is a Z06 engine. I have a ls6 on order , and thats why I chose it. Putting in the LT cam and a spring mod,,Figure if Chevy thought enough of the LS6 to put it in a Z06 Corvette , it was a good motor. Then again, I may be a moron.
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Old Sep 14, 2006 | 04:05 PM
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The bottom of the cylinders have vents cut in them on the LS6

Try this: http://www.cadillacfaq.com/faq/answe...0of%20power%22

this article may help

Ray
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Old Sep 14, 2006 | 04:05 PM
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Originally Posted by The Hopkinator
. Id say because Ls6 is a Z06 engine. I have a ls6 on order , and thats why I chose it. Putting in the LT cam and a spring mod,,Figure if Chevy thought enough of the LS6 to put it in a Z06 Corvette , it was a good motor. Then again, I may be a moron.
Nobody is saying that it isn't.
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Old Sep 14, 2006 | 04:06 PM
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Originally Posted by ISeeRed
The bottom of the cylinders have vents cut in them on the LS6

Try this: http://www.cadillacfaq.com/faq/answe...0of%20power%22

this article may help

Ray
Sweet thanks. Knowledge is power.
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Old Sep 14, 2006 | 04:07 PM
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See the article above
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Old Sep 14, 2006 | 07:58 PM
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I guess what I need is a casting number on the crank or pistons to be different than that of an LS1. Any ideas?

Thanks for the help thus far!
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Old Sep 16, 2006 | 06:54 PM
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Anybody?
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Old Sep 17, 2006 | 04:06 PM
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If it's casting numbers you want go here: http://www.automotiverebuilder.com/ar/eb040538.htm

There are some differences in the LS6 Crank.....

Ray
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Old Sep 19, 2006 | 10:51 AM
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That link lists the LS6 crank as the same casting number as the LS1. What do you know about it?
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Old Sep 19, 2006 | 03:22 PM
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Originally Posted by Obelix G.
That link lists the LS6 crank as the same casting number as the LS1. What do you know about it?
I thought the LS6 had a stronger one but it was the same in dimensions.
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Old Sep 19, 2006 | 08:23 PM
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does it have 243 heads? thats the LS6 head. 241 and 853 are the LS1 casting numbers.

run the block number. thats the only real way you will find out

there is no real advantage between a LS6 block and LS1 block, LS1 blocks are actualy stronger
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Old Sep 21, 2006 | 07:52 AM
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Originally Posted by Cop Car
there is no real advantage between a LS6 block and LS1 block, LS1 blocks are actualy stronger
So GM made a weaker block for a higher HP (LS6)application
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Old Sep 21, 2006 | 12:10 PM
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the short answer is... yes they did..

we are talking about lots of hp here..
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