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Ls7 Issues with dropping valves?

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Old Jun 26, 2009 | 05:24 PM
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Default Ls7 Issues with dropping valves?
Just picked up a ls7 and I've been hearing alot lately about them dropping valves? Anyone else heard about this? Would a better set of springs help out?
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Old Jun 26, 2009 | 05:42 PM
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I know the L92 had a bit of an issue. Dealer here in town has done four of them. Something about bad locks causing the issue. This is how I ended up with my L92 for $300!
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Old Jun 26, 2009 | 07:17 PM
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Seen it happen. Hardened cap came off of the valve tip, titanium wore away, and voila....

**Notice in this pic that the valve is open...it's actually stuck that way**








Cap was found in the lifter retainer tray and the lifter's c-clip was in the oil pan.
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Old Jun 26, 2009 | 07:36 PM
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Originally Posted by KCS
Seen it happen. Hardened cap came off of the valve tip, titanium wore away, and voila....

**Notice in this pic that the valve is open...it's actually stuck that way**








Cap was found in the lifter retainer tray and the lifter's c-clip was in the oil pan.
a little JB weld will fix it ...

thats gunna cost a good chunk of change to fix
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Old Jun 27, 2009 | 12:32 AM
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another one bites the dust ...
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Old Jun 27, 2009 | 12:58 AM
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Ouch!!!! One of the main reason I went with my AFR's and REV valves!
So what if I'm 11 cubes short.

Jimbo
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Old Jun 27, 2009 | 03:42 AM
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Originally Posted by KCS
Seen it happen. Hardened cap came off of the valve tip, titanium wore away, and voila....

Cap was found in the lifter retainer tray and the lifter's c-clip was in the oil pan.
Sad to see that damage man!

For that cap to get out......a little valve float/valvetrain seperation?

And are they stock springs?

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Old Jun 27, 2009 | 09:42 AM
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Originally Posted by rsz288
Sad to see that damage man!

For that cap to get out......a little valve float/valvetrain seperation?

And are they stock springs?

No, those are aftermarket dual springs, Comp's I think. Springs still had good pressure when they came off, not 100% sure what caused it. I'd bet valve float though.
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Old Jun 27, 2009 | 06:50 PM
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The photo of the broken spring that I posted was of a stock spring that broke when the car was traveling at only 35 miles an hour..broken spring, dropped the valve and ruined the bore of one cylinder ... GM replaced the engine...
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Old Jun 27, 2009 | 07:00 PM
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Originally Posted by slt200mph
The photo of the broken spring that I posted was of a stock spring that broke when the car was traveling at only 35 miles an hour..broken spring, dropped the valve and ruined the bore of one cylinder ... GM replaced the engine...
So a stock LS7? Agghhh!
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Old Jun 27, 2009 | 07:25 PM
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Wow I am in shock. My mouth hit the ground when I saw those pics. That sucks to see.
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