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Old Oct 18, 2012 | 10:05 AM
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Default true Ls6?

Hey guys as i posted before im looking for ls6 heads and today a add came up on craigslist for a ls6 engine. If i could get it it would be great. My question is how can you tell if its a true ls6? i used the search tool but could not find anything.

this is the only discription:

Ls6 and t56 trans approximate 85000 miles out of Cadillac. Complete with all exces. And wiring harness

true Ls6?-3g33lb3id5f25h55m9cah91dd1439a8db18db.jpg
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Old Oct 18, 2012 | 11:08 AM
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casting number on the heads should be 243 to start
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Old Oct 18, 2012 | 12:39 PM
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If it is out of the car ask for the engine casting number. It should be on the rear of the block on the drivers side.
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Old Oct 18, 2012 | 02:52 PM
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It will be very hard to tell with 100% confidence because, and correct me if I'm wrong, even if the numbers check out that it is a LS6 block and has 243 heads, it could really be just that, a LS6 block with 243 heads, but not have the LS6 cam ect... There was a small number of '01 & '02 f-bodes that came with a LS6 block, but that doesn't technically make the engine a LS6.
If all you are after are the "LS6" heads, then it really doesn't matter what cam and block it has as long as it has 243 heads on it.
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Old Oct 18, 2012 | 03:37 PM
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looks like the correct P/S reservior
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Old Oct 19, 2012 | 09:08 AM
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Thanks for the info guys! Sadly the guy wont email back. So it looks like ill still be looking around
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Old Oct 19, 2012 | 11:53 AM
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If it's out of a CTSV, it's an LS6.
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Old Oct 19, 2012 | 05:44 PM
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CTSV had 799 casting heads on some didnt they?
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Old Oct 22, 2012 | 03:58 AM
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Originally Posted by FASTFATBOY
CTSV had 799 casting heads on some didnt they?
What he said. Prolly the easiest way to tell would be to check the tail housing/bell housing on the trans...that'll let you know if it's out of a CTS-V, and if that checks out, it's prolly an LS6 out of a CTS-V
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