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2001 C5 and LS6 Intake

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Old Jul 15, 2004 | 01:35 AM
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Default 2001 C5 and LS6 Intake

I have an 01 C5 and am getting ready to do some mods. I have done a search and seen that differnt people say that the 2001 C5's do and don't come with the LS6 intake manifold. What is it? Thanks.
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Old Jul 15, 2004 | 09:57 AM
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Actaully, from threads that I have read in the past, they are both right Somewhere in the middle of the 2001 production year (I couldn't tell you exactly when) was when the switch occured.

Sorry I can't be more specific. Hopefully, someone that knows will chime in.

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Old Jul 15, 2004 | 11:11 AM
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I think that some of the 2001 cars had ls6 blocks but that the intake is ls1 unless you have the zo6.


More Than Zero
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Old Jul 15, 2004 | 02:23 PM
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My '01 vert. built 09/24/00 had the infamous whistling early LS6 manifold.
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Old Jul 15, 2004 | 08:10 PM
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How can I tell the difference?
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Old Jul 15, 2004 | 10:50 PM
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Originally Posted by Epara
How can I tell the difference?
That'a a tough one. If you take the manifold off, the bottom will be flat if it is an LS6 manifold. If it's an LS1 manifold, underneath it will angle upslightly from the ports towards the center. If it is on the car you can check the coolant crossover pipes. If you look at the front of the heads under the throttle body and you have an LS6 manifold, you will see a small pipe connecting the left and right heads with a 'T' close to the driver's side with a small hose connecting it to the throttle body. It will be one continuous pipe from one side to the other. An LS1 manifold will have the 'T' connection with hose on the driver's side, but it will arc back under the manifold and have a joint at the center and it will arc back out frim under the manifold to connect to the passenger's side head.

I know it's confusing but that is really the only way I know of to determine this unless you have the manifold off.
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Old Jul 15, 2004 | 10:52 PM
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Originally Posted by M_T_0
I think that some of the 2001 cars had ls6 blocks
LS1's and LS6's use the same block.
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Old Jul 15, 2004 | 11:52 PM
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Originally Posted by Devil Dog
LS1's and LS6's use the same block.
Actually, the LS6 block is different from 97 to early 01.
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Old Jul 16, 2004 | 02:01 AM
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OK, I have a small pipe connecting the left and right head together. So I guess I have an LS6 intake. Well that's one less thing I need to spend money on. Thanks guys.
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Old Jul 16, 2004 | 10:41 PM
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Originally Posted by Epara
How can I tell the difference?
There is a part number on the manifold, driver's side near the middle at the flange. Call dealer parts and they will tell you.
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Old Jul 16, 2004 | 10:53 PM
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The intake manifold on ALL 2001+ C5's is the same...................Coupe, Vert, and Z06.................
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Old Jul 16, 2004 | 10:54 PM
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Originally Posted by Devil Dog
LS1's and LS6's use the same block.
Actually they started using the LS6 block sometime on 2001 for all C5's.....I think mid production year.
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Old Jul 16, 2004 | 10:57 PM
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You should also check to see when your build date was to see if you have the first generation of coated pistons. If your car was built after April of 01 you most defenitly have them. WWW.Jacklatham.com has some good info you may want to check out which can answer alot of your questions.
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Old Jul 16, 2004 | 11:07 PM
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Originally Posted by Epara
I have an 01 C5 and am getting ready to do some mods...
You have definitely come to the right place. Which mods are you considering?

Mark
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