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Looking at buying 05 z51 need buying advice.

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Old 12-04-2018, 06:18 PM
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bridgeport13b
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Default Looking at buying 05 z51 need buying advice.

Hi a local guy is selling a manual 05 z51 corvette for 10k, any ways engine suffered a bad harmonic balancer that went out. Any ways car will come with a new engine with a 404ci ls2 with my choice of Mahle pistons, forged rods and crank, all arp hardware, and engine is being built by a very reputable shop by me . Anyways is this a good deal? Car has 150k but is in mint condition and has clean title with clean car fax. Is there any thing wrong with these cars that will prevent me from making serious power? I have a d1sc procharger on shelf and was curious as to what these chassis can take. Any significant improvements on later years besides tr6060?
Old 12-04-2018, 08:31 PM
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FAUEE
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Any c6 fir 10k ia a steal. If you're willing to invest more in making it right and fixing anything else on it, then buy it. I'd just be prepared for it to turn into a 17k car when all is said and done.
Old 12-04-2018, 10:46 PM
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bridgeport13b
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Originally Posted by FAUEE
Any c6 fir 10k ia a steal. If you're willing to invest more in making it right and fixing anything else on it, then buy it. I'd just be prepared for it to turn into a 17k car when all is said and done.
Appreciate the response, like I said I have a complete bullet proof short block, I have a l92 cnc ported heads to convert car to ls3 intake as well. If. I do get it I will pull trans and check it over and put billet keys in trans. Btw what’s your preference on steel frame vs aluminum?
Old 12-05-2018, 08:54 AM
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Originally Posted by bridgeport13b
Hi a local guy is selling a manual 05 z51 corvette for 10k, any ways engine suffered a bad harmonic balancer that went out. Any ways car will come with a new engine with a 404ci ls2 with my choice of Mahle pistons, forged rods and crank, all arp hardware, and engine is being built by a very reputable shop by me . Anyways is this a good deal? Car has 150k but is in mint condition and has clean title with clean car fax. Is there any thing wrong with these cars that will prevent me from making serious power? I have a d1sc procharger on shelf and was curious as to what these chassis can take. Any significant improvements on later years besides tr6060?
Sounds like a good deal as long as you're sure of the quality of the new engine build. As for other improvements, the diff in the '05's is known to be a weak point. Suggest you consider swapping out for an '07 or later, especially if you will be pushing more than stock HP.
Old 12-05-2018, 09:22 AM
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FAUEE
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Originally Posted by bridgeport13b


Appreciate the response, like I said I have a complete bullet proof short block, I have a l92 cnc ported heads to convert car to ls3 intake as well. If. I do get it I will pull trans and check it over and put billet keys in trans. Btw what’s your preference on steel frame vs aluminum?
Only the z06 and zr1 came with aluminum frames, so it's a moot point if you're not looking at those.
Old 12-05-2018, 09:43 AM
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irok
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Don't the dry sump Grand Sports have the aluminium frame also?
Old 12-05-2018, 09:47 AM
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I have 05, with 69,000 miles with no major repairs, just normal service, runs strong, fun to drive.

If you want to read the owners manual start now.

http://www.c6registry.com/Technical/manuals/2005OM.pdf
Old 12-05-2018, 09:51 AM
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cal45
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Originally Posted by irok
Don't the dry sump Grand Sports have the aluminium frame also?
Nope - 6 speed manual has dry sump LS3. Grand Sport automatics do not have a dry sump on their LS3.
Neither has the aluminum frame.
Old 12-05-2018, 09:58 AM
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Originally Posted by irok
Don't the dry sump Grand Sports have the aluminium frame also?
Don't think so.
All 3 are widebody, manual GS got a dry sump.
Aside from engines a major distinction was GS' steel frame vs both Z cars aluminum frames.
Old 12-05-2018, 10:06 AM
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Originally Posted by bridgeport13b
Is there any thing wrong with these cars that will prevent me from making serious power?
Just one weakness, rear end.
Some members drag racing experienced a catastrophic failure, rear exploded.
'05s driven 'normally' failure wasn't an issue, just extra stressed cars.
For that reason from '06+ rear end casting was beefed-up w/ a few more ribs making it much stronger, resistant to shock.
For HD use, an '05's rear end really needs to be upgraded.

Sounds like a great price, otherwise.

Old 12-05-2018, 12:51 PM
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Originally Posted by bridgeport13b
Any significant improvements on later years besides tr6060?
The '05 has a weaker differential case. There are a bunch of '05-only details like a 24-tooth reluctor crank, different ECU, shift lock solenoid, shift-to-reverse shutdown, different airbag setup, etc. which can complicate parts swapping with later years.
Old 12-05-2018, 03:56 PM
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Sounds like a good deal. I have an ‘05 Z51 Vert with 215K on it and it’s still fast and awesome with no smoke, rattles and tracks like it’s on rails. I have read on here that the ‘05 differentials are too weak for big horsepower, so that might be a consideration for you. Car is plenty fast for me as stock, but the higher ratio differential option makes my car feel like it accelerates faster than the others I’ve been in even with LS3s, slightly lower top end is something I’ll never experience.
Old 12-06-2018, 02:08 AM
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bridgeport13b
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Appreciate it everyone, any issues with trans? What can the t56 take In regards to power?
Old 12-06-2018, 07:34 AM
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The 05 has a very weak differential case. GM fixed this in06. A manual with additional power equals a catastrophic differential failure.
Old 12-06-2018, 08:38 AM
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Originally Posted by bridgeport13b
...any issues with trans? What can the t56 take In regards to power?
t56 is just fine, it's the case holding it that fails.
There're a few stalwart t56 owners who prefer 'em to a 6060.

Old 12-08-2018, 10:58 AM
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Originally Posted by bridgeport13b
Hi a local guy is selling a manual 05 z51 corvette for 10k, any ways engine suffered a bad harmonic balancer that went out. Any ways car will come with a new engine with a 404ci ls2 with my choice of Mahle pistons, forged rods and crank, all arp hardware, and engine is being built by a very reputable shop by me . Anyways is this a good deal? Car has 150k but is in mint condition and has clean title with clean car fax. Is there any thing wrong with these cars that will prevent me from making serious power? I have a d1sc procharger on shelf and was curious as to what these chassis can take. Any significant improvements on later years besides tr6060?

Since the car cannot be driven at this time, you don't know what else is wrong with it, right? A bad harmonic balancer is not the death of an engine. Just curious if the trans and rear end are also shot. $10K is a steal, if you don't mind taking the risk that other items will likely need work, too.
Old 12-08-2018, 05:17 PM
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For 10K. clean title, and the car running , your either getting a great deal, or there is something wrong your not seeing instead.

Carfax and GM service history reports are only as good as the data they receiver to list on the reports, and could be something major wrong with the car that is not showing up on the reports to check for such that way isntead.

If your really want to buy the car, then find an independent shop that you can trust to do a full pre-purchase inspection on the car. Hence at 150K, going to take a few grand in parts to tighten the suspension back up, but its really the drive line and other parts that need to be gone over with a fine tooth comb on what needs to be fixed sooner or not as well.

Truth is, with the price of the car so low with even a rebuilt motor, makes me think that there are other problems with the car, such as wreck or water damage not reported/correct correctly, or the car is a title salvage car isntead.

Last edited by Dano523; 12-08-2018 at 05:19 PM.
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Old 12-09-2018, 04:48 AM
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bridgeport13b
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Originally Posted by Dano523
For 10K. clean title, and the car running , your either getting a great deal, or there is something wrong your not seeing instead.

Carfax and GM service history reports are only as good as the data they receiver to list on the reports, and could be something major wrong with the car that is not showing up on the reports to check for such that way isntead.

If your really want to buy the car, then find an independent shop that you can trust to do a full pre-purchase inspection on the car. Hence at 150K, going to take a few grand in parts to tighten the suspension back up, but its really the drive line and other parts that need to be gone over with a fine tooth comb on what needs to be fixed sooner or not as well.

Truth is, with the price of the car so low with even a rebuilt motor, makes me think that there are other problems with the car, such as wreck or water damage not reported/correct correctly, or the car is a title salvage car isntead.
Car is not running, the deal is I will put the engine in and I will also have to buy clutch. Engine is a 404ci ls2. I should of mentioned that a local dealership is selling it and it’s the owners personal car he bought for himself. He said that basically the car is sitting in there storage which should be housing other cars to sell since it’s truck season. He said he has a lot of trucks coming in and needs space. Car is also from a gm dealer leasing program that was sold after its lease at auction. Owner/dealer seems very honest and did point out the cons. Underneath of car has literally no scratches or corrosion and has no signs of diff or trans leaks. Even frame rails paint looks really nice, engine bay looks almost mint even trans bellhousing is super clean with very minimal black soot on throughout bearing.
Old 12-09-2018, 04:58 AM
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bridgeport13b
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Originally Posted by buckmeister2
Since the car cannot be driven at this time, you don't know what else is wrong with it, right? A bad harmonic balancer is not the death of an engine. Just curious if the trans and rear end are also shot. $10K is a steal, if you don't mind taking the risk that other items will likely need work, too.
Yeah your right, I am planning for tr6060 or built t56 anyways. On the engine, the balancer some how broke timing cover and timing chain slipped and ended up lightly bending valves and leaving dings in the pistons.
Old 12-09-2018, 01:16 PM
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What the others said about your pipe dreams, forget it.


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