Cadillac CTS-V 2004-2007 (Gen I) The Caddy with an Attitude...

What not to have happen to your LS6

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Old 11-22-2010, 12:17 PM
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What kind of track? Drag racing, autocrossing, open tracking?
Old 11-22-2010, 05:04 PM
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Originally Posted by demang
When should i really consider changing the springs out on a stock motor that i track 4-6 times a year? I have 92k on it right now.
before they break!
Old 11-23-2010, 08:47 AM
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open track.
i hope i do before they brake lol.
Old 11-30-2010, 02:53 AM
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That last pic is kinda scary. Is that your shop?
Old 12-05-2010, 08:51 PM
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I forgot to update this, but I drove the car home Wednesday before Thanksgiving and have beem driving it steady since with no issues.

All done it cost me around $420 to fix it and 3-4 solid evenings of work.
Old 12-11-2010, 01:00 PM
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Very nice fix. Maybe I should change mine with 135k? What springs did you put in?
Old 12-11-2010, 02:46 PM
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Cool. Now I know who to take mine to when it breaks - You're not too far away.


Maybe I can get a ride in that Syclone while I'm there! I miss mine...
(except for the constant tune-ups!)

10.8 @ 125 @ 20psi; 1.70 60'. McCoy Motorsports built 4.3. It was capable of 28psi, but I never ran it that hard.
Attached Thumbnails What not to have happen to your LS6-syclone-atco-2004.jpg   What not to have happen to your LS6-syclone-atco-2004-2.jpg  
Old 12-11-2010, 02:50 PM
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Smile ls6

Woops,my bad I sent u a PM but it seems after i read the rest of the thread that u have it up and running....congrats
Old 12-11-2010, 04:40 PM
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Geez, $420 for all that ain't bad.

What is it about LSx intake valve springs? Same thing happened to ronr at about 60k miles a couple of summers ago on his LS6.

It's not the same, really, but I lost two exhaust springs at the same time on my '69 Vette wa-a-y back in the day. I'm just sayin' ...
Old 12-11-2010, 11:03 PM
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Originally Posted by chitown21y
Very nice fix. Maybe I should change mine with 135k? What springs did you put in?
I just got a set of Z06 yellow springs from Summit.

Originally Posted by mhhamrhead
Cool. Now I know who to take mine to when it breaks - You're not too far away.


Maybe I can get a ride in that Syclone while I'm there! I miss mine...
(except for the constant tune-ups!)

10.8 @ 125 @ 20psi; 1.70 60'. McCoy Motorsports built 4.3. It was capable of 28psi, but I never ran it that hard.
Cool my truck had a Mccoy "built" 4.3 in it when i got it. I can tell you it would not have done 28psi very long the way they put things together
Old 12-12-2010, 12:16 AM
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Originally Posted by Syclone354
Cool my truck had a Mccoy "built" 4.3 in it when i got it. I can tell you it would not have done 28psi very long the way they put things together
lol...Well, long story short - it took them 3 trys to get mine right...

Though they did take full responsibility for the problems(crank bearings went twice) and in the end that's all I can ask.(I'm a big believer in **** happening. Always.)
Old 01-12-2011, 12:45 PM
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exactly what mine did at 70k miles......... eff LS6 springs...
Old 01-12-2011, 12:48 PM
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Z06 what springs did you put back in?
Old 01-12-2011, 02:21 PM
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Originally Posted by chitown21y
Z06 what springs did you put back in?
If you do a mild cam, the Comp 26918 (@ ~ $190) spring will work fine.

For more aggressive grinds (and a greater expenditure), the Comp 26921, Patriot 8501-BSBC or the PAC 1518 is a better bet. The Comp 26921 and the Patriot 8501 are dual spring setups, while the PAC 1518 is a Beehive single.

With any of the above, a good set of moly pushrods is de rigeur.




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