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Valve spring installed height

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Old Aug 5, 2007 | 01:19 PM
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Default Valve spring installed height

I'm installing a set of Comp Cams 918 springs and need a little more installed height. Using the stock retainers the installed height of the springs is about .760. I need to know how to get the height up a bit as there are no extra shims under the springs. Can I get offset keepers, if so who makes them adn which ones do I need?

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Old Aug 5, 2007 | 03:14 PM
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Originally Posted by RE AND CHERYL
I'm installing a set of Comp Cams 918 springs and need a little more installed height. Using the stock retainers the installed height of the springs is about .760. I need to know how to get the height up a bit as there are no extra shims under the springs. Can I get offset keepers, if so who makes them adn which ones do I need?

Thanx
Re'
Did you measure that with or without the located? Installed height should be 1.800. Are you saying you are at 1.760? If so I believe the stock locaters are either .040 or .060.

Do you have the integrated seals on your car or did you take them off and replace them with just a seal?
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Old Aug 5, 2007 | 05:32 PM
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what cam? You can get away with installing them at 1.750" if you're running .600" lift or less. I actually recommend it if you have aggressive lobes.

If the're gonna break because you got a bad batch that will happen no matter where you install them.
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Old Aug 5, 2007 | 10:45 PM
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Originally Posted by Yeahdoug
what cam? You can get away with installing them at 1.750" if you're running .600" lift or less. I actually recommend it if you have aggressive lobes.

If the're gonna break because you got a bad batch that will happen no matter where you install them.
Running a MTI Stealth II with .581 Lift on both. The springs were rated at .600 lift and with the lower installed height I figured I'm about .020 short. By the springs specs I still have about .080 till coil bind. Am I OK??

Do you have the integrated seals on your car or did you take them off and replace them with just a seal?
I've got the stock valve stem seals. They seem to be one with a spacer the valve spring sits on.

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Old Aug 6, 2007 | 04:50 AM
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None of the springs setup at 1.800, even the stock ones. I think you are fine with your current installed height, as long as your cam isn't too aggressive.
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Old Aug 6, 2007 | 10:22 AM
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Originally Posted by vettenuts
None of the springs setup at 1.800, even the stock ones. I think you are fine with your current installed height, as long as your cam isn't too aggressive.
Define too aggressive.

I'm running a MTI Stealth II with .581 lift.

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Old Aug 6, 2007 | 12:28 PM
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thaqats not an agressive cam...agressive=vindicator ms4 trex.....ect ect
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Old Aug 6, 2007 | 01:44 PM
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If you are .060 from coil bind that is perfect. Some of the more aggressive cams require shimming the springs .050 from coil bind to get the most open pressure possible.
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Old Aug 6, 2007 | 02:45 PM
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Originally Posted by RE AND CHERYL
Running a MTI Stealth II with .581 Lift on both. The springs were rated at .600 lift and with the lower installed height I figured I'm about .020 short. By the springs specs I still have about .080 till coil bind. Am I OK??
Install them at 1.750" and you'll be golden.

The real coil bind number for a 918 is around 1.080.
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Old Aug 6, 2007 | 07:46 PM
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Originally Posted by 5_02ls1
thaqats not an agressive cam...agressive=vindicator ms4 trex.....ect ect
I know it's not an aggerssive cam compared to what many of you run. But none the less, I only want to put this together once. And don't want any problems I can avoid.

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