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LS1 or LS6 Block?

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Old Sep 14, 2003 | 09:14 AM
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Default LS1 or LS6 Block?

I have a 02 coupe and I was talking with a friend who has a 01 Berger Stage 2 Camaro. He stated that if you have a LS1 Block that there is a circle imprinted on the block right behind the water pump. He has this on his car and my other friend who has a 98 coupe has the same marking. Mine does not, does this mean I have a LS6 block? I was under the impression only the ZO6 had the LS6. I know I have the LS6 intake but I thought that was it. Any comments would be appreciated. :confused:
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Old Sep 14, 2003 | 09:24 AM
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Default Re: LS1 or LS6 Block? (1 BAD C5)

2001 and newer C5's all have the LS6 block.

:cheers:
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Old Sep 14, 2003 | 09:28 AM
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Default Re: LS1 or LS6 Block? (Y2Kvert4me)

2001 and newer C5's all have the LS6 block.

:cheers:
:iagree:
The production change occured midway thru the 01 production year
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Old Sep 14, 2003 | 11:10 AM
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Default Re: LS1 or LS6 Block? (runamuk)

:iagree: :cheers:
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Old Sep 14, 2003 | 12:11 PM
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Default Re: LS1 or LS6 Block? (1 BAD C5)

Thanks, guys! I thought I knew everything about my car. I guess there is something to learn. :smash:
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Old Sep 15, 2003 | 10:37 AM
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Default Re: LS1 or LS6 Block? (1 BAD C5)

I read an article that stated they even put some LS6 blocks in the latter Camaro's
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Old Sep 15, 2003 | 03:51 PM
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Default Re: LS1 or LS6 Block? (98ISGR8)

I've heard the LS6 block is actually cheaper than the LS1, so it stands to reason GM would use it.
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Old Sep 15, 2003 | 04:04 PM
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Default Re: LS1 or LS6 Block? (Heretic)

I have a bare block what is the easiest way to tell if its a LS1 or LS6.

Thanks :cheers:
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Old Sep 15, 2003 | 04:34 PM
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Default Re: LS1 or LS6 Block? (93Polo)

I have a bare block what is the easiest way to tell if its a LS1 or LS6.

Thanks :cheers:
Here is a pic of the casting #




Here is a pic showing the breathing holes at the bottom of the cylinder sleeves






[Modified by Flyin'Brian, 3:37 PM 9/15/2003]
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Old Sep 15, 2003 | 04:42 PM
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Default Re: LS1 or LS6 Block? (Flyin'Brian)

Brian thanks thats what I was looking for :cheers:
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Old Sep 15, 2003 | 05:00 PM
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Default Re: LS1 or LS6 Block? (93Polo)

Ok, I have a LS6 block does that make my motor technically an LS6 or just a LS1 with LS6 parts? Does anyone have the differences between the two. I know this may sound silly but I was going to get some LS1 badging for the motor when I came up with that question, I just want to be correct if I badge it. :confused:
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Old Sep 15, 2003 | 07:41 PM
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Default Re: LS1 or LS6 Block? (1 BAD C5)

The LS6 also has a different heads and cam. I would say it is an LS1 unless you have the whole package on a stock engine. LS1/ 350 HP. LS6/ 405 HP.
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Old Sep 16, 2003 | 10:50 AM
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Default Re: LS1 or LS6 Block? (Flyin'Brian)

Is that block drilled and tapped for the chain tensioner?
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Old Sep 16, 2003 | 11:41 AM
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Default Re: LS1 or LS6 Block? (Heretic)

Is that block drilled and tapped for the chain tensioner?
No, just some of the early blocks were drilled. I heard they used it in '97 because of problems with the timing chain that was later fixed and its use was discontinued.
FYI they will not work with some or all double roller chains.
I have a new one I will sell if anyone wants it.
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Old Sep 16, 2003 | 11:49 AM
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Default Re: LS1 or LS6 Block? (Greg_E)

The LS6 also has a different heads and cam. I would say it is an LS1 unless you have the whole package on a stock engine. LS1/ 350 HP. LS6/ 405 HP.
The LS6 block has some improvements but no real power gain. As a result it is cheaper for GM to build 1 aluminum block for LS1/LS6 engines. The LS6 motors do have different heads and cam.
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Old Sep 16, 2003 | 05:19 PM
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Default Re: LS1 or LS6 Block? (93Polo)

:cool: Thanks guys! I rest my case.
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Old Sep 17, 2003 | 10:57 AM
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Default Re: LS1 or LS6 Block? (Flyin'Brian)

Thats interesting, as the 12561168 block I just got from valvegod has a couple drilled and tapped holes above the crank on the front of the block, I assumed they were for the tensioner.

The GMPP catalog says the following
88958607 Timing Chain Damper, LS1, LS6
This timing chain damper is intended for high engine speed applications and is used to improve timing chain life. Some blocks require drilling and taping - an instruction sheet is included.

Seems like a good idea if you are going to use a stock type chain.
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Old Sep 17, 2003 | 01:51 PM
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Default Re: LS1 or LS6 Block? (Heretic)

:cool: Don't know if there is any reason to which ones have it and which ones don't.

Here's a pick of one that don't have the holes
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Old Sep 17, 2003 | 02:06 PM
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Default Re: LS1 or LS6 Block? (1 BAD C5)

Just for kicks, below is a pic of a C5R shortblock that a forum member sent me last year during his build-up. You can see what looks like a timing chain damper behind the oil pump. Must be using those mounting holes mentioned.

Unrelated, note the use of ARP head studs.

Pretty, ain't she?

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Old Sep 17, 2003 | 02:17 PM
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Default Re: LS1 or LS6 Block? (1 BAD C5)

Hey Chee-Toe,
It sounds like now you will be forced to get the heads and cam package. :cool:

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