07-24-2018, 08:53 AM | #15 |
Drives: 2015 Z/28 #0058 Join Date: Apr 2018
Location: Pittsburgh, PA
Posts: 814
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I am well aware of the valve guide issue on LS7s, we caught my brother's 2008 z06 just in time...metal shaving throughout the motor at ~10k mi. Full rebuild insued: bearings, Mast heads, Comp cam, new oil plumbing, etc.... ~$10k later (with a Mantic twin disk), it now has 598 rwhp / 550 rwtq
Having bought my 2015 z/28 CPO'd at, my powertrain warranty is up in 2021... we'll see where I stand in 3 yrs (if the car is even still with me). I'm in no rush to void a warranty, nor throw more money at this car.
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Current:
- '15 Z/28 #0058 | White | A/C | Speakers | Michelin PS4S 305/30/19's - '22 Ridgeline RTL | White | Ebony, '22 CR-V EX-L Hybrid | White | Ebony Sold: - '15 Z/28 #0048 | White | A/C | Speakers | Michelin PS4S 305/30/19's https://www.instagram.com/__jon__athan__/ |
07-24-2018, 09:19 AM | #16 | |
Drives: 2015 Z/28 Black Join Date: Nov 2016
Location: Los Angeles
Posts: 340
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Quote:
Pick of dirty and cleaned oil plug Here you can see the super small metal shavings.
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2015 Black Z/28
70 Chevelle SS396 01 M3, 88 Land Cruiser |
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07-24-2018, 10:05 AM | #17 |
Drives: 2015 Z/28 #0058 Join Date: Apr 2018
Location: Pittsburgh, PA
Posts: 814
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Quote:
My brother's shavings were true 'shavings'. Large, sitting under valve cover.
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Current:
- '15 Z/28 #0058 | White | A/C | Speakers | Michelin PS4S 305/30/19's - '22 Ridgeline RTL | White | Ebony, '22 CR-V EX-L Hybrid | White | Ebony Sold: - '15 Z/28 #0048 | White | A/C | Speakers | Michelin PS4S 305/30/19's https://www.instagram.com/__jon__athan__/ |
07-25-2018, 12:28 PM | #18 |
"1/LE Rebel Alliance"
Drives: 18 Black 1SS 1LE “Siouxsie Join Date: Nov 2013
Location: Johnston, Iowa
Posts: 324
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I see. I was under the impression the LS7 deficiencies had been addressed due to the Camaro team having to make slight modifications to the LS7 to fit it in the engine bay. The Voodoo engines in the GT350s are having engine failures and oil consumption problems. It's a tracked spreadsheet now.
Sidebar, but anyone here with helicopter experience may remember the swashplate bearing issues CH-53Es were having due to the bearings not being machined properly. Downed the fleet twice. |
07-26-2018, 07:57 AM | #19 |
Jumanji
Drives: '14 Z/28 - AGM - No A/C Join Date: Mar 2014
Location: Alaska
Posts: 1,688
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So far, 4 known posts on the forum, and two 2nd hand possible discussed via Facebook. I dont think that is conclusive evidence to say there is or is not a problem. As of this moment in time, we are talking about (6) .33% (point 33%, not even a full 1%) of the 1801 Z/28s made. My eyes are open, and ears perked up, as I am very interested as we are a few years out from the last car rolling off the assembly line. We should be seeing more reported issues as these cars get more miles on them. The next few years will be telling!
Also, of all the info that ive read, not once has anything been mentioned about modifying the LS7 to fit in the engine bay of the 5th gen. I would want to see a source to that hear-say.
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07-26-2018, 08:13 AM | #20 |
@MrRaZ28
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The only "modification" I know of is redoing the oil lines and designing special tri-y headers for it.
At 49.6K miles with me putting 6k and 3 track days where I drove relatively hard for my experience level, I should have noticed issues by this point. I have had zero since I purchased the car last October. |
07-26-2018, 08:31 AM | #21 |
Drives: 1969 Z/28 + 2015 Z/28 Join Date: Aug 2009
Location: Pittsburgh Area, Pa
Posts: 534
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The only thing I remember being modified was a lip on the firewall to get the LS7 in the engine bay.
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You know you are having fun when you are getting 3.4 mpg !!
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07-26-2018, 08:40 AM | #22 |
@MrRaZ28
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I have not. Honestly, I'm not interested in doing a tear down, nor doing a half ass job and going the wiggle test route.
It's covered under extended warranty so if it DOES go, new engine. Edit: Honestly, I'm not worried about it. I *THINK* I've got the highest mileage Z28 right now. Mark is creeping up on me though lol. |
07-26-2018, 09:08 AM | #23 |
"1/LE Rebel Alliance"
Drives: 18 Black 1SS 1LE “Siouxsie Join Date: Nov 2013
Location: Johnston, Iowa
Posts: 324
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I read about them having to redo the exhaust headers to fit. Made me wonder if they touched anything in else in the engine.
This is honestly good to hear that it's a very very small percentage of failures. The swashplate bearing issues in the CH53Es were narrowed down to a machine that wasn't producing the bearings right (just slightly out of round by like .002 or so). My rotorhead brain made me think of this as soon as LS7s were reporting failures. |
07-26-2018, 09:29 AM | #24 |
I lol at everyone worried about the LS7 issue. This has been fixed since 2012 and Chevy posted a bulletin about it. It took me half a second to search for answers. The issue was one of Katech's suppliers, fixed long ago. Sorry to the guy who tore his motor apart because of worry, hopefully you were planning to build it anyways.
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2015 Camaro Z/28 Black
Sold: 2010 Camaro 1SS/RS |
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07-26-2018, 07:09 PM | #25 | |
Drives: '94 Z28+ '15 Z/28 Join Date: Jun 2009
Location: Cheektowaga, NY
Posts: 1,282
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Quote:
Look at all of the guys posting with 35,000+ miles on their cars. No issues. If the valve guides were bad and out of spec, or soft or whatever, then those engines would have some serious noises coming from under the hood. There's no way it will affect some cars within 500 miles, while other cars will run forever.
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1973 Mach 1, 351C cruiser
'15 Z/28 Red Hot, A/C 1980 Z28- resto-mod project 1979 Y84 Trans Am 1986 IROC-Z |
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07-27-2018, 08:20 AM | #26 |
Drives: Black 2015 Z28 #457 Join Date: Sep 2016
Location: Dallas, TX
Posts: 214
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Where in Ohio are you? Do you know how to do this/would you be able to show me? I'm currently working in Wooster Ohio.
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07-27-2018, 11:32 AM | #27 |
Drives: 2015 z28 Black w/ac #645 Join Date: Jan 2017
Location: Southeast Texas
Posts: 337
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Dont know if this helps but heres some stats on a 2012 LS7 set of heads that was done at a reputable shop. Kinda gives you an idea. Been saving it for when i check mine before i modify in the future .
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07-27-2018, 05:32 PM | #28 | |
Drives: 2015 Camaro Z/28 Join Date: Nov 2016
Location: Out west
Posts: 68
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