Cts V dropped a Valve!!!
03-20-2012, 01:34 PM
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Cts V dropped a Valve!!! As I was pulling out I the parking lot where I work last week my 05 cts v started knocking, lost power and locked up! Car only has 80k miles on it so I was shocked to say the least. All stock except for intake. Pulled the valve cover....
03-20-2012, 01:35 PM
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03-20-2012, 02:53 PM
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Are those valves the same as found in the C6 Z06's? My buddy at a speed shop said they won't even put one on a dyno unless the owner signs off that they may drop a valve due to the number of times they've seen issues with the valves.
For some reason those sodium filled valves tend to snap under full load.
For some reason those sodium filled valves tend to snap under full load.
03-20-2012, 03:11 PM
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Are those valves the same as found in the C6 Z06's? My buddy at a speed shop said they won't even put one on a dyno unless the owner signs off that they may drop a valve due to the number of times they've seen issues with the valves.
For some reason those sodium filled valves tend to snap under full load.
For some reason those sodium filled valves tend to snap under full load.
LOLOL, what!?
There were some early year failures with guys running stupid spring pressures and the valve giving, but that's a little extreme, haha.
03-20-2012, 03:13 PM
#11
that blows! 80K that's just gotta be a freak occurrence, especially if you were just leaving a parking lot. 
first i have heard of that.. i thought the sodium filled valves were better than traditional solid stem valves b/c they allowed for more heat to escape and keep the exhaust valves from burning up. plus are lighter decreasing the load on the springs
https://ls1tech.com/forums/generatio...id-valves.html
Are those valves the same as found in the C6 Z06's? My buddy at a speed shop said they won't even put one on a dyno unless the owner signs off that they may drop a valve due to the number of times they've seen issues with the valves.
For some reason those sodium filled valves tend to snap under full load.
For some reason those sodium filled valves tend to snap under full load.
https://ls1tech.com/forums/generatio...id-valves.html
03-20-2012, 04:14 PM
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I have to get this going pretty soon, and on a tight budget unfortunately. Hoping to replace the piston, hone the cylinder, and check the rod and bearings. Gotta find out if these heads can be built or I need a new one. I would like to at least get some better valve springs! Any suggestions? Only have $1500ish to work with. 
03-20-2012, 04:49 PM
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Are those valves the same as found in the C6 Z06's? My buddy at a speed shop said they won't even put one on a dyno unless the owner signs off that they may drop a valve due to the number of times they've seen issues with the valves.
For some reason those sodium filled valves tend to snap under full load.
For some reason those sodium filled valves tend to snap under full load.
I would bet money the head could be repaired but a set of ported 243's cost so little I would probably go that way. Or see how much it cost to repair and port your stock heads.
Also, I have 5 good used pistons with less than 80k. They still have the rod attached and are in good condition. If you are interested let me know. I'll let you have one cheap.
03-20-2012, 04:50 PM
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You can get 243 or 799 (same damn thing) without the hollow valves on the cheap, with no performance loss...think sets go for $350 on ebay...singles are even cheaper. Spend the $50 and get all new LS6 "Yellow" springs when you reassemble. Also, GMPP has a head gasket and head bolt kit (think its for F-body's) on the cheap for like $90...search GENIII engine section. Otherwise, you can use 12589226 - hd gasket (pr) ($17.57) and ARP bolts (since they are re-usable), like I did.
LS6 pistons are the same as LS1's (just matched weight), if you post over in GENIII engine section you may find quite a few people that have OE LS1 take outs for just the shipping costs.
That really sucks man, looks like the spring broke, dropping the valve into the cylinder. Hope the wall is not cracked. FWIW...you may be better off getting an LS1 shortblock (think there was one in the classifieds here for $750?) and swap your cam with the ebay heads. No machine work, nothing to question.
Last resort, you could always get a junk yard 5.3 and swap your LS6 cam, pushrods, and new LS6 valve springs for a low buck solution. I would do it in a heartbeat if my back was against a wall. This would need a tune, but you probably would not notice much of a difference from stock after the tune anyhow.
Best of luck to ya. Its honestly going to be pretty damn hard building a motor on $1500.
LS6 pistons are the same as LS1's (just matched weight), if you post over in GENIII engine section you may find quite a few people that have OE LS1 take outs for just the shipping costs.
That really sucks man, looks like the spring broke, dropping the valve into the cylinder. Hope the wall is not cracked. FWIW...you may be better off getting an LS1 shortblock (think there was one in the classifieds here for $750?) and swap your cam with the ebay heads. No machine work, nothing to question.
Last resort, you could always get a junk yard 5.3 and swap your LS6 cam, pushrods, and new LS6 valve springs for a low buck solution. I would do it in a heartbeat if my back was against a wall. This would need a tune, but you probably would not notice much of a difference from stock after the tune anyhow.
Best of luck to ya. Its honestly going to be pretty damn hard building a motor on $1500.
03-20-2012, 05:08 PM
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I read somewhere the ctsv didn't get he sodium filled valves or yellow springs. So would zo6 243s be considered an upgrade? And I've been looking into the ls1 or 5.3 options, but was hoping to save my motor. The cylinder has a very light scratch that you can't hang a nail on. Maybe an inch long. Maybe I can hone it out?
03-20-2012, 05:17 PM
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You have an 05 so yes you do have the hollow valves. 04-05 had the LS6 which had hollow valves. 06-07 had the LS2 which has solid valves.
C5 Z06 heads are exactly what you already have.
C5 Z06 heads are exactly what you already have.