6.2 blown !
Team Owner
Joined: Jan 2007
Posts: 29,063
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From: cookeville tennessee
ttt
Nature of the beast this motor has been more than one that this has happen too. Valve spring more than not if you were not hard into a pull with the car.
Go back now with good pistons & diff valves & aftermarket spring. Now if you had aftermarket spring in it was a valve. How many miles did you have on it with the new cam. I would hope whom ever did the cam & tune was good with the work on it...
Go back now with good pistons & diff valves & aftermarket spring. Now if you had aftermarket spring in it was a valve. How many miles did you have on it with the new cam. I would hope whom ever did the cam & tune was good with the work on it...
Team Owner
Joined: Oct 2004
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Alternatively, your mods and tune may have had something to do with it. The unmolested OEM engines don't "blow up" very often.
Whether you were driving "hard or fast" has nothing to do with when an engine fails. The damage that causes a failure is more often than not cumulative over time until the failure point is reached. It could reach that failure point at idle. When the LS7 in my Z06 let go about a decade ago, it was at 2K rpm and about 20K miles.
Whether you were driving "hard or fast" has nothing to do with when an engine fails. The damage that causes a failure is more often than not cumulative over time until the failure point is reached. It could reach that failure point at idle. When the LS7 in my Z06 let go about a decade ago, it was at 2K rpm and about 20K miles.
Last edited by Foosh; Apr 25, 2018 at 04:13 PM.
Pro
Joined: Sep 2000
Posts: 678
Likes: 310
From: McKinney Texas
My guess is there was too much timing in it and it was detonating severely...
What were the details?
How much power was it making, and on what fuel or fuels.
Its hard to know just looking at a pile of parts.
That sucks big time though.
What were the details?
How much power was it making, and on what fuel or fuels.
Its hard to know just looking at a pile of parts.
That sucks big time though.
Last edited by MCK_Z06; Apr 25, 2018 at 06:03 PM. Reason: fixed shitty spelling..
Team Owner
Joined: Jan 2007
Posts: 29,063
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From: cookeville tennessee
Now with pic's that don't look like a per say new head like in your other pic with that much carbon on it like under the head gasket with only about 1500 miles on it. Something was done wrong from looking at this. Looks like that was # 8 hole that gave out so more than not in the tune not enough gas in the rear holes. Plus it really looks like that back hole had space between head & gasket for 1500 miles on it. Hate it that block & one head is shot.Robert
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Race Director
Joined: Sep 2014
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It's amazing how tough OEM engines are these days.
Back-in-the-day an engine that made it to 100k miles was celebrated.
It truly was rare.
Modding/tuning one of these newer engines can really be problematic.
It's better just to buy a car with a factory engine that HAS the power output desired to begin with.
Dig
Joined: Jan 2006
Posts: 5,466
Likes: 1,126
From: Port Saint Lucie FLORIDA & HONDURAS
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
ttt
Per say these pistons are crap the weakest part of the motor. It really don't take much to chew up a head & piston like that when you break a valve like that. So that said for 1500 miles that head just don't look like 1500 miles on it.
When the car broke could you hear a misfire are like the motor had a knock & like a little loose of power just before it went to hell on you.
But from your pic's that valve went down from the spring r the retainer are the 2 little clips that hold the valve in place came out on it.
Man sorry to see this on you its a big PITA to do all that over again. More so if the shop that did it really didn't know what he was doing on these cars. But again that one head just don't look correct for 1500 miles. I would show it to the shop that did the work & see what they tell you on it. But I know where that will go also for you. I am sure he will tell you that it had to be hitting 7,k plus rpm. Robert
When the car broke could you hear a misfire are like the motor had a knock & like a little loose of power just before it went to hell on you.
But from your pic's that valve went down from the spring r the retainer are the 2 little clips that hold the valve in place came out on it.
Man sorry to see this on you its a big PITA to do all that over again. More so if the shop that did it really didn't know what he was doing on these cars. But again that one head just don't look correct for 1500 miles. I would show it to the shop that did the work & see what they tell you on it. But I know where that will go also for you. I am sure he will tell you that it had to be hitting 7,k plus rpm. Robert
Thread Starter
Instructor
Joined: Mar 2015
Posts: 135
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From: Unanimous
The Corvette was running fine then just stopped running & I pulled over immediately. I had the car towed to the shop that did the work on it & was told it was a part failure that is out of anyone's control. . That really makes no since to me with just 1 out of 8 that look like that .
I originally meant to put this in the Tech/Performance forum and was wondering if I could also post it (or be moved) there hopefully for some more information .
Thanks for all the help so far
I originally meant to put this in the Tech/Performance forum and was wondering if I could also post it (or be moved) there hopefully for some more information .
Thanks for all the help so far
Last edited by 6.2Blown; Apr 26, 2018 at 02:12 PM.
Moderator
Joined: Feb 2006
Posts: 39,064
Likes: 17,931
From: DFW Area TX
The Corvette was running fine then just stopped running & I pulled over immediately. I had the car towed to the shop that did the work on it & was told it was a part failure that is out of anyone's control. . That really makes no since to me with just 1 out of 8 that look like that .
I originally meant to put this in the Tech/Performance forum and was wondering if I could also post it (or be moved) there hopefully for some more information .
Thanks for all the help so far
I originally meant to put this in the Tech/Performance forum and was wondering if I could also post it (or be moved) there hopefully for some more information .
Thanks for all the help so far
Burning Brakes
Joined: Mar 2006
Posts: 1,102
Likes: 587
From: Seal Rock Oregon
Once a valve head is dropped, it does an enormous amount of damage to the piston, head, etc. I once had a carb butterfly drop and since it was only brass, it didn't do anywhere near the amount of damage that you experienced.
Drifting
Joined: Oct 2013
Posts: 1,746
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From: Fort McMurray Alberta
2018 C7 of Year Finalist
My car dropped a valve too. Making 568whp on a base supercharger kit and headers. Driving on the highway at 2K rpms is when mine took a **** as well. Never did find out why, all I know is GM wouldn't touch it under warranty and just blamed it on the supercharger. Now I have a fully built 416 instead.
Last edited by blue_bomber697; Apr 26, 2018 at 04:01 PM.
Supporting Vendor
Joined: Feb 2009
Posts: 4,420
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From: Mesa Az
what year are you? i have seen 3 local 14's break stock valve springs and drop valve. 1 was a bolt on car, 2 were 100% stock. 15+ lt1's have blue springs were 14's are yellow.
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Cordes Performance Racing aka "CPR"
Owner of AZ's premier LSX/LTX motorsports shop
http://cordesperformanceracing.com/
www.facebook.com/cordesperformanceracing.com
joe@cordesperformanceracing.com
480-359-5914