[NotFast]

My Z06 supposedly had valve spring issues - we've been making internal combustion engines for 100+ years and GM's vendor is still cheaping out on these?

[arpad_m]

Originally Posted by NotFast

My Z06 supposedly had valve spring issues - we've been making internal combustion engines for 100+ years and GM's vendor is still cheaping out on these?

GM and their infamous penny pinching. For example, and this is just one of many, my 2018 has auto-dimming driver side and rearview mirrors, but the passenger side mirror does not dim, which must have saved them about $10 and now I get blinded by bro dozers, unless I'm in the right lane. One can't even buy a dimming version, the vendor doesn't make it.

Actually, this happens more as a technology matures, advances further on the diminishing return curve and there is little else left to optimize for cost reduction. I think the best place to be is right behind the bleeding edge when things mostly work already, but the cheaping out hasn't yet begun.

[VR Baron]

870 miles on mine. Normal driving and taking it to 35-4000 . Sticker says build date 9/20, but was told actually was 10/2. Car runs like a champ in all respects. We will see. A friends zle built in July, no issues. Same sis freibd is a gm tech. He and dealer looked up my car, no recalls. So gm probably knows now which cars could be affected.Many have said seems to be in first 250 miles or so. Some as little as driving out of the lot with under 30.

[lt4camaro]

Originally Posted by NotFast

My Z06 supposedly had valve spring issues - we've been making internal combustion engines for 100+ years and GM's vendor is still cheaping out on these?

the 427 7 liter Z06 had cylinder head valve guide issues. The current valve spring issue is because of a manufacturing process problem , not from a vendor that all of a sudden decides to make a poorly spec'd valve spring cheaper imo.

[spitz]

I had a tech at the chevy dealer tell me that when the tsb came out about the valve spring issue they were told to test each car in that time window of possible valve spring issues and on their lot, they had 4 vehicles fail the test. The cars were taken to the back lot waiting for the repair to be done before being sold or put back on the lot. I know one was a camaro because I almost bought it but my wife didn't like the blue with red hash stripes on the fender. another was a pickup truck not sure about the other two. My luck was I bought mine a week before the tsb came out. I think after buying my new corvette and 4 other new cars from them a phone call would have been nice.

[lt4camaro]

Originally Posted by spitz

I had a tech at the chevy dealer tell me that when the tsb came out about the valve spring issue they were told to test each car in that time window of possible valve spring issues and on their lot, they had 4 vehicles fail the test. The cars were taken to the back lot waiting for the repair to be done before being sold or put back on the lot. I know one was a camaro because I almost bought it but my wife didn't like the blue with red hash stripes on the fender. another was a pickup truck not sure about the other two. My luck was I bought mine a week before the tsb came out. I think after buying my new corvette and 4 other new cars from them a phone call would have been nice.

I wonder how they were told to test the individual cars, any compression test of valve spring test only detects a actual broken valve spring. Also most of the failures were after a few hundred miles of driving. The test on the TSB is for cars already having audible or a rough engine tell tail symtoms

[lt4camaro]

Originally Posted by VR Baron

870 miles on mine. Normal driving and taking it to 35-4000 . Sticker says build date 9/20, but was told actually was 10/2. Car runs like a champ in all respects. We will see. A friends zle built in July, no issues. Same sis freibd is a gm tech. He and dealer looked up my car, no recalls. So gm probably knows now which cars could be affected.Many have said seems to be in first 250 miles or so. Some as little as driving out of the lot with under 30.

I have almost 1200 on mine, been up to 6-6400 wot shift points 5 times and quite a few hard pulls from 3k to 5500 then shift etc. The build month and year on your door jamb sticker of 9/20 means the car was built during the 9th month of 2020, actual build month/day should not be 10/2. Get a copy of your build sheet, will tell you exactly what day the car came off the line. Mine was 11/02, motor was built 10/17. I think I am safe

[CHASLT1]

Originally Posted by lt4camaro

I have almost 1200 on mine, been up to 6-6400 wot shift points 5 times and quite a few hard pulls from 3k to 5500 then shift etc. The build month and year on your door jamb sticker of 9/20 means the car was built during the 9th month of 2020, actual build month/day should not be 10/2. Get a copy of your build sheet, will tell you exactly what day the car came off the line. Mine was 11/02, motor was built 10/17. I think I am safe

Near 900 miles on mine and i have done some WOT runs and burst and no probs yet. My 2019 C7 never ran anywhere near as fast as my 2021 LT1.

[lt4camaro]

Originally Posted by CHASLT1

Near 900 miles on mine and i have done some WOT runs and burst and no probs yet. My 2019 C7 never ran anywhere near as fast as my 2021 LT1.

I dont know CHASLT1, I cannot say that . I had a 2015 base M7 stingray with NPP. I have done some of the minor tweaks to my LT1 as I did with my stingray and I am sure its not as fast. I eventually had my C7 dyno tuned with mid pipe, AFE intake, 180 stat, and my own ported/smoothed out TB. The car dyno'd at 430 rear wheel and my best 1/4 mile pass was a 11.78 , 121 mph and thats with a manual trans and a not so good 1.971 60 ft time. The stingray is 300lbs lighter. IMO, this LT1 2021 A10 camaro just is not going to run that quick. I should be able to do a better 60 ft with the A10, but 12.0 should be about it. I also have a 2019 M7 GS corvette. That car is 125 lbs heavier than my 2015 stingray, but has more aggressive gearing in the 7 speed, the GS feels as good if not better than the stingray. I never took the GS down the 1/4 mile

[CHASLT1]

Originally Posted by lt4camaro

I dont know CHASLT1, I cannot say that . I had a 2015 base M7 stingray with NPP. I have done some of the minor tweaks to my LT1 as I did with my stingray and I am sure its not as fast. I eventually had my C7 dyno tuned with mid pipe, AFE intake, 180 stat, and my own ported/smoothed out TB. The car dyno'd at 430 rear wheel and my best 1/4 mile pass was a 11.78 , 121 mph and thats with a manual trans and a not so good 1.971 60 ft time. The stingray is 300lbs lighter. IMO, this LT1 2021 A10 camaro just is not going to run that quick. I should be able to do a better 60 ft with the A10, but 12.0 should be about it. I also have a 2019 M7 GS corvette. That car is 125 lbs heavier than my 2015 stingray, but has more aggressive gearing in the 7 speed, the GS feels as good if not better than the stingray. I never took the GS down the 1/4 mile

My C7 has had all kinds of probs. It just never did feel right the day i left the dealer. A normal C7 should be a bit faster than my LT1. The LT1 does feel stronger than my 2013 C6 when it was stock.

[lt4camaro]

Originally Posted by CHASLT1

My C7 has had all kinds of probs. It just never did feel right the day i left the dealer. A normal C7 should be a bit faster than my LT1. The LT1 does feel stronger than my 2013 C6 when it was stock.

I do agree though that my car anyway... a no optioned 2021 LT1 Other than the A10 trans does feel strong. I have borla s mufflers on it already, a Soler ported 91 mm TB, my own air box mod (not a drastic cut out), have about 40 lbs off of the car and it feels good.