[Z06] 2001 vs 2002-2004
Racer
Joined: Jan 2012
Posts: 264
Likes: 3
From: Vacaville CA
My 01 had the ring issue. But had all the service records, indicating that it had been resolved which was nice. Mine does leak a bit out of the diff. About 3 drops if I park it in the garage for a week.
Racer
Joined: Dec 2010
Posts: 386
Likes: 0
From: Alachua Florida
Edit: 125K miles and counting BTW
Last edited by Wood81; Jan 12, 2013 at 04:38 PM.
Racer
Joined: Oct 2010
Posts: 323
Likes: 9
If it was just for the 01's, why did my Amsoil connection (subdriver) who has an 02 tell me about what he does to fix his?
As far as the valve float issue, i'm pretty sure my car REDLINES at 6500, so I would not worry about valve float above redline.
My 01 Z has been awesome, there may be some turds around, but my experience has been positive so far...love the car.
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
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AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
Race Director
Joined: Jan 2001
Posts: 14,999
Likes: 312
From: P-town Baby! Virginia
I had an '01 for a dd for a couple years..and it was great. I don't think you can really appreciate the hp difference between years....so I would just look for the best overall deal on the nicest Z from whatever year.
Thread Starter
Drifting
Joined: Nov 2011
Posts: 1,279
Likes: 18
From: Oklahoma
If this is true then I probably will. The leaky ring issues concern me a bit as I am a road racer.
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Drifting
Joined: Oct 2011
Posts: 1,980
Likes: 10
From: Crook County
There is not much difference performance wise, Main difference is the the 02-04 C5Z's cam is slightly larger. I made 367 RWHP in my 01 Z06 with just a CAI and Borla Catback. Thats 15whp more then 02-04's make.. I put those numbers down right after a CAI/Catback 08 C6Z put down 455 RWHP....
Last edited by Breze84; Jan 13, 2013 at 11:46 PM.
Drifting
Joined: Oct 2011
Posts: 1,980
Likes: 10
From: Crook County
Comparing the 01 to 02-04:
1. Heads up display is awesome but can be retrofitted.
2. Transmission forks upgraded: unless you plan on modding transmission would want to think about this. I will tell you that the stock transmission holds up to alot in the 02-04. I presently have 600whp and transmission is fine.
3. value: an 01 will never be worth as much to a buyer in the future no matter how close they are
4. From my personal experience, 01's were beat on pretty hard, meaning the owners pushed them hard. Just my experience though.
I owned an 02 before the present 04.
1. suspension-the shocks were changed in the 04 and I don't know about others but the difference is substantial when pushing hard. That said, you can always change the shocks to newer ones.
Bottom Line: I say get an 02-04 for value reasons and because the have a stronger transmission that wont need to be upgraded unless pushing serious power beyond 600whp or so.
1. Heads up display is awesome but can be retrofitted.
2. Transmission forks upgraded: unless you plan on modding transmission would want to think about this. I will tell you that the stock transmission holds up to alot in the 02-04. I presently have 600whp and transmission is fine.
3. value: an 01 will never be worth as much to a buyer in the future no matter how close they are
4. From my personal experience, 01's were beat on pretty hard, meaning the owners pushed them hard. Just my experience though.
I owned an 02 before the present 04.
1. suspension-the shocks were changed in the 04 and I don't know about others but the difference is substantial when pushing hard. That said, you can always change the shocks to newer ones.
Bottom Line: I say get an 02-04 for value reasons and because the have a stronger transmission that wont need to be upgraded unless pushing serious power beyond 600whp or so.
Also for those who dont know already very few early production 01 Z06's in the summer of 2000 had minor oil consumption problems that match that of a LS2 because of Piston ring flutter with constant abuse over 4K RPM. The later production runs fixed that problem and most of the early run Z06's had it fixed under warranty via TSB. Also There has been a lot of 02-03's that had Valve spring failure do to crappy springs... Also everyone rants about the 02-04 Sodium filled valves in the 243 heads, Most dont know that most 01 Z06's with a production date of 03/01 and later got this upgrade as well. No difference between the non sodium filled valves performance wise. Ask any LSX builder!!!
Last edited by Breze84; Jan 13, 2013 at 06:36 PM.
Drifting
Joined: Oct 2011
Posts: 1,980
Likes: 10
From: Crook County
By that time GM had Rectified all the problems that the previous production runs were having... Im also 4/01 build date and never had a drop of oil, Diff leak ect ect ect....
Last edited by Breze84; Jan 13, 2013 at 06:41 PM.
Safety Car
Joined: Oct 2004
Posts: 4,816
Likes: 132
From: Plano TX
Oil consumption on 10% of 2001 Z06.. Valve spring failure on 3-4% of 2002-2003 Z06.. Numbers are very small when you look at the total of units produced.. I did some extensive research on my own and posted it about 3 years ago. The 2002-2004 have a bigger camshaft for more power.. Here is a great web site for info on all Corvettes,, this link shows the difference between 2001 and 2002 http://corvetteactioncenter.com/spec...l#.UPOJt2f_2Tw
Check this link out too.. http://www.corvettemuseum.org/specs/2002/z06.shtml
Check this link out too.. http://www.corvettemuseum.org/specs/2002/z06.shtml
Last edited by David426; Jan 13, 2013 at 11:36 PM.
Melting Slicks
Joined: May 2007
Posts: 2,014
Likes: 48
From: Dayton Ohio
The MN12 did not get a steel 3-4 fork until late 2002/early 2003. Yes the 04-06 GTO and 04-07 CTS v's have the same MN12 but they did come with steel fork since change happened late 02/ early 2003.
Safety Car
Joined: Nov 2005
Posts: 4,361
Likes: 929
From: Huntsville Alabama
the steal shift fork, does not make the tranny hold more power...
it just less prone to bending when the DRIVER is over shifting the car (SLAMMIGN THE **** OUT F THE SHIFTER).. does not have ANYTHING to do with the trannsision holding power.
it just less prone to bending when the DRIVER is over shifting the car (SLAMMIGN THE **** OUT F THE SHIFTER).. does not have ANYTHING to do with the trannsision holding power.
Intermediate
Joined: Feb 2012
Posts: 47
Likes: 6
From: California
Just saying that given the strength of the standard transmission, no upgrade is needed unless going way beyond power wise. Given this premise, the difference between the two is steel shift forks which was an upgrade.
Intermediate
Joined: Feb 2012
Posts: 47
Likes: 6
From: California
Uhhhh 01-04 Z06's have the same M12 T56 transmissions, Same as the CTS-V's and same as the 04-06 GTO. Same everything. Only difference is they changed the clutch preassure plate slightly in 02 to have a little more clamping power and they added a 3rd and 4th gear steel shift fork in 04. I have to disagree with everything you said about value lol... Also where are you getting that all 01 Z06's were beat on hard? That doesnt even make sense lol...
Also for those who dont know already very few early production 01 Z06's in the summer of 2000 had minor oil consumption problems that match that of a LS2 because of Piston ring flutter with constant abuse over 4K RPM. The later production runs fixed that problem and most of the early run Z06's had it fixed under warranty via TSB. Also There has been a lot of 02-03's that had Valve spring failure do to crappy springs... Also everyone rants about the 02-04 Sodium filled valves in the 243 heads, Most dont know that most 01 Z06's with a production date of 03/01 and later got this upgrade as well. No difference between the non sodium filled valves performance wise. Ask any LSX builder!!!
Also for those who dont know already very few early production 01 Z06's in the summer of 2000 had minor oil consumption problems that match that of a LS2 because of Piston ring flutter with constant abuse over 4K RPM. The later production runs fixed that problem and most of the early run Z06's had it fixed under warranty via TSB. Also There has been a lot of 02-03's that had Valve spring failure do to crappy springs... Also everyone rants about the 02-04 Sodium filled valves in the 243 heads, Most dont know that most 01 Z06's with a production date of 03/01 and later got this upgrade as well. No difference between the non sodium filled valves performance wise. Ask any LSX builder!!!
Look at prices of cars for sale....the market is the market
