Official - Z/28s w/Bad Valves or Dropped Valves - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Zslash28 · 07-24-2018, 06:50 AM

Seems to be alot of concerns regarding the LS7 head issue and our Z/28s. I would like this thread to be where we capture only those cars that have had one of the following;
1. Any failed factory installed LS7 engine.
2. Any dropped valve resulting in GM repair.
3. Any car that had heads replaced,
and the heads failed valve inspection.

Please provide info as to what led to the failure if known. If the failure mode is unknown, please state so.

Also, for the sake of keeping this on topic, only post info on known failed Z/28 LS7s, or Z/28 heads that failed valve inspection. I dont care about the Corvettes, or "maybe, might, could" assumptions on the Z/28 LS7 heads being suspect. Lets stick to facts, and real events, not 2nd or 3rd hand stories.

2013blackgt · 07-24-2018, 09:11 AM

I had Katech install their stage 2 LS7 package on my z/28 and they said my valve guides were out of spec. I don't have the numbers though, they never gave them to me. Fyi, my car had 7,800 miles on it when they did the work.

Zslash28 · 07-24-2018, 09:29 AM

Excellent info, thank you for sharing. I wonder if they kept record of the valve specs after they did your work.

2013blackgt · 07-24-2018, 10:06 AM

They do.

Mark_Z28 · 07-24-2018, 10:35 AM

Quote:

Originally Posted by 2013blackgt

I had Katech install their stage 2 LS7 package on my z/28 and they said my valve guides were out of spec. I don't have the numbers though, they never gave them to me. Fyi, my car had 7,800 miles on it when they did the work.

That's funny considering they are the reason the original valve guides were out of spec.

Nasty Z28 · 07-24-2018, 01:08 PM

my car #1019 2015 AGM ac/speakers was a GM buy back car. Had oiling issues. From the info i have the motor was fixed/replaced at 3500ish miles. I bought it with 3600 miles on it and had the heads done almost right away along with a few other things. Car now has 5200 miles on it with no issues.

4 FN 27 · 07-24-2018, 07:20 PM

The story...of Unscheduled High Speed Disassembly...

https://www.camaro5.com/forums/showthread.php?t=419077

Nothing conclusive to say it was the Valve Issue and nothing to say it wasn't.

All I know is my Dealer and GM took care of me 100% with no hassle.

JeffInDFW · 04-21-2019, 08:08 PM

Quote:

Originally Posted by Mark_Z28

That's funny considering they are the reason the original valve guides were out of spec.

I'm not being snarky, asking honestly....Can you share why this is the case? My understanding was that Linamar was who produced the LS7 heads, and it was Linamar that had one of their machines set out of spec which polluted the pool of available heads. Thanks for anything you can share.

07-24-2018, 09:11 AM	#2
2013blackgt Drives: Sedan Join Date: Feb 2013 Location: Aurora Posts: 124	I had Katech install their stage 2 LS7 package on my z/28 and they said my valve guides were out of spec. I don't have the numbers though, they never gave them to me. Fyi, my car had 7,800 miles on it when they did the work. __________________ ]

07-24-2018, 09:29 AM	#3
Zslash28 Jumanji Drives: '14 Z/28 - AGM - No A/C Join Date: Mar 2014 Location: Alaska Posts: 1,688	Excellent info, thank you for sharing. I wonder if they kept record of the valve specs after they did your work. __________________ Keeper of the 5th Gen Z/28 Registry. Registry Facebook. Follow: @5th_gen_z28_registry I track wrecked Z/28s Total lost -41

07-24-2018, 10:06 AM	#4
2013blackgt Drives: Sedan Join Date: Feb 2013 Location: Aurora Posts: 124	They do. __________________ ]

07-24-2018, 07:20 PM	#7
4 FN 27 Drives: 2015 Z28 Join Date: Dec 2014 Location: Grant Minnesnota Posts: 311	The story...of Unscheduled High Speed Disassembly... https://www.camaro5.com/forums/showthread.php?t=419077 Nothing conclusive to say it was the Valve Issue and nothing to say it wasn't. All I know is my Dealer and GM took care of me 100% with no hassle. __________________ "Resale value is my beneficiaries problem...unless they can bury my in my Z...problem solved."

07-24-2018, 06:50 AM	#1
Zslash28 Jumanji Drives: '14 Z/28 - AGM - No A/C Join Date: Mar 2014 Location: Alaska Posts: 1,688	Official - Z/28s w/Bad Valves or Dropped Valves Seems to be alot of concerns regarding the LS7 head issue and our Z/28s. I would like this thread to be where we capture only those cars that have had one of the following; 1. Any failed factory installed LS7 engine. 2. Any dropped valve resulting in GM repair. 3. Any car that had heads replaced, and the heads failed valve inspection. Please provide info as to what led to the failure if known. If the failure mode is unknown, please state so. Also, for the sake of keeping this on topic, only post info on known failed Z/28 LS7s, or Z/28 heads that failed valve inspection. I dont care about the Corvettes, or "maybe, might, could" assumptions on the Z/28 LS7 heads being suspect. Lets stick to facts, and real events, not 2nd or 3rd hand stories. __________________ Keeper of the 5th Gen Z/28 Registry. Registry Facebook. Follow: @5th_gen_z28_registry I track wrecked Z/28s Total lost -41

07-24-2018, 01:08 PM	#6
Nasty Z28 Drives: 2015 Z/28 Join Date: Apr 2018 Location: MN Posts: 14	my car #1019 2015 AGM ac/speakers was a GM buy back car. Had oiling issues. From the info i have the motor was fixed/replaced at 3500ish miles. I bought it with 3600 miles on it and had the heads done almost right away along with a few other things. Car now has 5200 miles on it with no issues.