LS6 Spring Maximum Lift
Thread Starter
Joined: Mar 2006
Posts: 304
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From: Moorpark, CA
LS6 Spring Maximum Lift I see lots of information for the yellow LS6 springs that maximum lift is .575. How much lift has anyone here on this board used with that cam reliably? I know it would be close, but would anyone have enough nerve to run those springs on a Comp XE-R lobe with ~.580 lift?
Teching In
Joined: Sep 2006
Posts: 22
Likes: 2
From: Houston, TX
I have used these springs with a TR220 .553" lift cam with no problems set up at 1.790" installed height. They have about 90-95 Lbs seat pressure and 280-300 Lbs open pressure at 1.230". They should be very reliable and for max RPM, I would run them with hollow stem or Titanium Intake valves due to the lower seat pressure. I limited the max RPM at 6200 for safety and reliability and even used stock pushrods, no issues. Stock pushrods are a safety valve in case of valve to piston contact. For STD weight valves and higher RPM limits and lifts, I would use the Comp 918 Springs set up at 120 Lbs seat pressure.
Paul
Paul
I used them on my old GT2-3 which had lift of .571/.578 for over 15K miles BUT they are super soft lobes. I wouldn't chance those springs with anything more "radical".
Just get better springs and be safe.
Just get better springs and be safe.
I read somewhere on a GM bulletin that their max lift was in the .550's but i've seen other people say as high as .575 so I dunno. Honestly, for the low cost of springs compared to a motor, why risk it, just get the best ones you can.
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Joined: Sep 2003
Posts: 1,058
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Agree w/hotrodpaul's data, but PLEASE DO NOT USE 918s'. I just took 16 off my car last night. 10 were broke. If you want to see, let me know.
There are 3 springs on my list of upgrades right now.
1. Comp 921s. better for high rpm
2. Patriot PRC Golds. slightly less force needed to open valve.
3. Crane's geniii dual spring, a perfect spring for hi po apps IMHO.
JUST DO NOT USE THE 918. I HAVE FIRST HAND EXPERIENCE W/THIS PROBLEM.
There are 3 springs on my list of upgrades right now.
1. Comp 921s. better for high rpm
2. Patriot PRC Golds. slightly less force needed to open valve.
3. Crane's geniii dual spring, a perfect spring for hi po apps IMHO.
JUST DO NOT USE THE 918. I HAVE FIRST HAND EXPERIENCE W/THIS PROBLEM.
Thread Starter
Joined: Mar 2006
Posts: 304
Likes: 1
From: Moorpark, CA
Thanks for the info guys. I've been nervous about the 918's. That's one of the reasons why I'm interested in LS6 springs, because they come with a 100,000 mile waranty in a factory car with .551 lift..... Who in the aftermarket can claim that. I just don't know how much farther they can be pushed. I've been thinking that dual spring would be the way to go for high lift, but the added expense of new retainers and seats kind of turns me off. But, you get what you pay for.
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Joined: Sep 2003
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I have had 2 Z06's. The one in my sig, the 03 is not my current car. I gotta update the sig. I now have a STOCK 02 Z.
NOV 06, I put a 216/222-585-116 cam in w/918 springs. Rest of the car is stock. Due to a new project I'm on, I put the stock cam back in APR 07.
The other day I was racing a bike and I noticed after a hard pass, I lost power. I did not hit the rev limter just wound up 2nd to 6500 and heard a snap. Could not figure it out, but engine vibrating slightly but still running "ok".
I thought either clutch or valve springs. When I pulled the valve covers, what I saw was below. 10 of 16 of my comp springs were broken. Keep in mind I RARELY ran the car that hard even when it had the cam in it and rarely tap the limiter on shifts. In other words, this happened under normal driving conditions with a stock engine.
Also, PRC Gold duals are $270 shipped. AND the LS6 isn't as crappy as most think for mild cams. But if you shim them to tension, gonna lose coil bind space.
NOV 06, I put a 216/222-585-116 cam in w/918 springs. Rest of the car is stock. Due to a new project I'm on, I put the stock cam back in APR 07.
The other day I was racing a bike and I noticed after a hard pass, I lost power. I did not hit the rev limter just wound up 2nd to 6500 and heard a snap. Could not figure it out, but engine vibrating slightly but still running "ok".
I thought either clutch or valve springs. When I pulled the valve covers, what I saw was below. 10 of 16 of my comp springs were broken. Keep in mind I RARELY ran the car that hard even when it had the cam in it and rarely tap the limiter on shifts. In other words, this happened under normal driving conditions with a stock engine.
Also, PRC Gold duals are $270 shipped. AND the LS6 isn't as crappy as most think for mild cams. But if you shim them to tension, gonna lose coil bind space.
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TECH Apprentice
Joined: Jun 2004
Posts: 317
Likes: 52
From: Charleston, SC
Originally Posted by Formulated
I see lots of information for the yellow LS6 springs that maximum lift is .575. How much lift has anyone here on this board used with that cam reliably? I know it would be close, but would anyone have enough nerve to run those springs on a Comp XE-R lobe with ~.580 lift?
Last edited by DUSTYWS6; May 28, 2007 at 07:06 AM. Reason: grammar
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
EBZ06, you are not answering the right questions
1- How cold was your motor on that day or have you got on it before reaching operating temp before that.
2- Did you heat cycle your springs after install
3- What install height were you running
4- What pushrods were you running
5- What was your preload
6- You are running springs of different kinds in one motor? like together?
What happened is not normal and unless you got a shitty batch, it most likely is related to one or more of the questions above.
1- How cold was your motor on that day or have you got on it before reaching operating temp before that.
2- Did you heat cycle your springs after install
3- What install height were you running
4- What pushrods were you running
5- What was your preload
6- You are running springs of different kinds in one motor? like together?
What happened is not normal and unless you got a shitty batch, it most likely is related to one or more of the questions above.
TECH Fanatic
Joined: Sep 2003
Posts: 1,058
Likes: 1
Originally Posted by PREDATOR-Z
EBZ06, you are not answering the right questions
1- How cold was your motor on that day or have you got on it before reaching operating temp before that.
2- Did you heat cycle your springs after install
3- What install height were you running
4- What pushrods were you running
5- What was your preload
6- You are running springs of different kinds in one motor? like together?
What happened is not normal and unless you got a shitty batch, it most likely is related to one or more of the questions above.
1- How cold was your motor on that day or have you got on it before reaching operating temp before that.
2- Did you heat cycle your springs after install
3- What install height were you running
4- What pushrods were you running
5- What was your preload
6- You are running springs of different kinds in one motor? like together?
What happened is not normal and unless you got a shitty batch, it most likely is related to one or more of the questions above.
3. stock, 1.8" I believe
4. stock, which are the correct size.
5. about 3/4 turn
6. i was putting the stock springs back on as I was taking photos and to illustrate what a normal springs looks like.
Honestly dude, there is no reasonable explanation except the springs are trash. Also, I would be interested to know of people who have visually inspected their springs and their status
Any cam with more than 224 duration and/or more lift than .570" I would step up to a better spring than LS6 Yellows. I ran a 218/222-.562/.566 cam on yellows and it did just fine. Yellow springs are mild so you need to run em with a mild cam.
Thread Starter
Joined: Mar 2006
Posts: 304
Likes: 1
From: Moorpark, CA
Originally Posted by DUSTYWS6
Springs need to be selected based on both lift and ramp rate. Although the LS6 spring may look appropriate based on lift, it will not be suitable for cams that have fast ramp rates.
