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LT6 engine failures/problems

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Old Jul 8, 2025 | 02:28 PM
  #541  
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FWIW there are '25 model year cars with the same front cover leak as my '23 had and a local buddy's '24 has. Just saw one on FB where guy had engine out (with pics) at 600 miles. So seems GM can't figure out how to seal the front of these engines in a reliable manner.
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Old Jul 8, 2025 | 02:42 PM
  #542  
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Originally Posted by qwazipsycho
I can't answer that question. However, I can tell you everything I've read on this site says GM will NOT make offers over and above the MSRP on the car.
This is what I was told by a friend who was offered a buy-back on their new Z06. Problem is they already added full ppf, ceramic, tint, etc. adding almost $8k on top of what they had into the Z. So they declined the buy-back.
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Old Jul 8, 2025 | 02:58 PM
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Originally Posted by JABCAT
This is what I was told by a friend who was offered a buy-back on their new Z06. Problem is they already added full ppf, ceramic, tint, etc. adding almost $8k on top of what they had into the Z. So they declined the buy-back.
My repurchase covered all additional expenses (taxes, fees, and $3,300 in PPF/ceramic). Another buddy had his HTC try and open on track which ripped up the roof and his included all his PPF/ceramic + $15K in wheels/tires; no issues. Maybe it depends on state lemon laws?
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Old Jul 8, 2025 | 08:28 PM
  #544  
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Originally Posted by RapidC84B
My repurchase covered all additional expenses (taxes, fees, and $3,300 in PPF/ceramic). Another buddy had his HTC try and open on track which ripped up the roof and his included all his PPF/ceramic + $15K in wheels/tires; no issues. Maybe it depends on state lemon laws?
Definitely could be. I also don't think they pressed the dealer/GM as they "love the car".
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Old Jul 11, 2025 | 12:29 PM
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Originally Posted by hamta
I had my C6 Z06 for 15 years and 25,000 miles and didn't have a SINGLE engine problem!!! As did many other LS7 owners. You only hear about the problem issues (or the TROLLS)...
2008 Z06 (race car) has 17k miles on chassis, and engine #3 (Texas Speed 427) in a crate in my garage. 2009 3LZ Z06 has 41k miles, is bone stock, and perfect. Just about to hit 6,000 miles on the '24 3LZ Z07. Engine and transmission been great so far. Still getting the backup camera addressed. Guess it's hit or miss, but in general, these engines are still pretty reliable.


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Old Jul 20, 2025 | 10:01 PM
  #546  
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^ I am thinking the more your drive it the better.
600 miles and having issues is something GM needs to run to ground.
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Old Jul 21, 2025 | 07:48 PM
  #547  
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Originally Posted by RedZ4me
wrong - there were waaaay too many ls7 lost and GM did nothing
The engines that failed were do to either over revs or over modded LS7. Zero bone stock non over reved LS7 had a engine drop a valve!
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Old Jul 22, 2025 | 08:03 AM
  #548  
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Originally Posted by Brian Ritter
The engines that failed were do to either over revs or over modded LS7. Zero bone stock non over reved LS7 had a engine drop a valve!

Just Google LS7 valve drop and see if there are any articles, videos, and information about it. Talk about being in denial.
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Old Jul 22, 2025 | 08:18 AM
  #549  
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Originally Posted by Phil1098
Just Google LS7 valve drop and see if there are any articles, videos, and information about it. Talk about being in denial.
There are plenty and all of them were not bone stock and non over revved
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Old Jul 22, 2025 | 08:25 AM
  #550  
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Originally Posted by Brian Ritter
There are plenty and all of them were not bone stock and non over revved
That’s 10,000 times false I instruct at track days a lot and I have personally seen multiple OEM stock cars blown up. The cause of the valve guide issues is well documented. It has nothing to do with over revs or modifications..
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Old Jul 22, 2025 | 08:28 AM
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Originally Posted by RapidC84B
That’s 10,000 times false I instruct at track days a lot and I have personally seen multiple OEM stock cars blown up. The cause of the valve guide issues is well documented. It has nothing to do with over revs or modifications..
You must not be a mechanic! It shows that you only know how to sit in the seat!
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Old Jul 30, 2025 | 12:33 AM
  #552  
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Andrew goins built my lt6.
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Old Jul 30, 2025 | 12:36 AM
  #553  
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How many times did you change the trans filter? That makes a big difference in this car
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Old Jul 30, 2025 | 09:01 AM
  #554  
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See 556 below
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Old Jul 30, 2025 | 09:02 AM
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Originally Posted by JDSKY
Just read the lemon law rules for your state but most states are the same. Here is what you would be due in my state which includes refunding sales tax:

When you request a refund, the manufacturer must refund the full purchase price of the vehicle plus any sales tax, finance charge, amount paid by the consumer at the point of sale, and any collateral costs. The manufacturer is allowed to deduct from the refund a “reasonable allowance” for use of the vehicle. This “reasonable allowance” deduction cannot exceed the value obtained by taking the vehicle’s mileage reported at the first time the consumer notified the manufacturer or dealer of the defect(s) and dividing that number by 100,000 (or 20,000 in the case of motorcycles). Example. Vehicle A is a lemon. The purchase price of Vehicle A was $30,000. Vehicle A had 10,000 miles on it when it was first brought to the dealership for repair of the defect. 10,000 miles at first reporting of defect = 0.1 × $30,000 purchase price = $3,000 100,000 The manufacture could deduct up to $3,000 from the customer’s refund as a reasonable allowance for use of the vehicle. When the manufacturer provides a refund, you must return the lemon vehicle to the manufacturer and provide them the vehicle title, including all endorsements necessary to transfer the title to the manufacturer.
Completely reasonable requirements for manufacturer and buyer
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Old Aug 31, 2025 | 08:54 PM
  #556  
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28 pages and the rate of activity seems to be dropping. Are people hearing about or experiencing serious failures and just not posting them, excluding the fueling fire issue?
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Old Aug 31, 2025 | 09:21 PM
  #557  
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Originally Posted by Brian Ritter
You must not be a mechanic! It shows that you only know how to sit in the seat!
I am a mechanic and the failurefailures to stock engines were the cause of being over reving!
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Old Aug 31, 2025 | 09:38 PM
  #558  
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Originally Posted by Brian Ritter
You must not be a mechanic! It shows that you only know how to sit in the seat


Originally Posted by Brian Ritter
I am a mechanic and the failurefailures to stock engines were the cause of being over reving!
are you arguing with yourself?
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Old Aug 31, 2025 | 09:45 PM
  #559  
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Originally Posted by Brian Ritter
I am a mechanic and the failurefailures to stock engines were the cause of being over reving!
How do ya over Rev with a Rev Limiter
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Old Aug 31, 2025 | 11:06 PM
  #560  
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Originally Posted by cajunboyz
How do ya over Rev with a Rev Limiter
Manual transmission, think of trying a downshift to 4th and hitting 2nd instead . It's often called mechanical over-rev.
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