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What dual springs are these?

Generation III Internal Engine 1997-2006 LS1 | LS6

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What dual springs are these?

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Old

May 18, 2005 | 03:39 PM

#1

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From: Ft. Myers Fl

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What dual springs are these?

I know they are double springs and they are on a set of Absolute speed heads I have.
I am pretty sure they are comp springs but dont know what kind.
Anyone?

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What dual springs are these?-dsc00562.jpg

What dual springs are these?-dsc00566.jpg

Old

May 18, 2005 | 04:45 PM

#2

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I believe Absolute typically used Comp springs, I think the 987's

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May 18, 2005 | 04:47 PM

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maybe 921s?

Old

May 18, 2005 | 05:06 PM

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From: Ft. Myers Fl

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This is what I am thinking.
I just dont know if they are the 921's or the 987's?
I was hoping there was a way to tell from the pic's.

Old

May 18, 2005 | 05:21 PM

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the 921's are direct drop ins 1.2xx, while the 987's are a 1.4xx

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May 18, 2005 | 05:27 PM

#6

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From: Ft. Myers Fl

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Damn that might help.
Just need to measure them.
Thanks

Old

May 18, 2005 | 06:40 PM

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They almost look like my Manley duals.

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Old

May 18, 2005 | 07:09 PM

#8

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how old are they, i know jay used both 978's and 987's.

Comp 978's: Dual springs (requires machining of spring pockets)

O.D: 1.46
I.D: .697
seat pressure: 126 @ 1.850
open presure: 368 @ 1.250
coil bind: 1.195
spring rate: 403

Comp 987's: Dual Springs (require maching of spring pockets)

O.D: 1.430
I.D: .697
seat pressure: 121 @ 1.800
open presure: 388 @ 1.200
coil bind: 1.150
spring rate: 344

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Old

May 18, 2005 | 08:02 PM

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Well, this isn't looking good.

Edit - Is there anyway to tell exactly what spring it is from like a number on the spring or something? Cuz 978's and 987's ain't gonna cut it for my cam!

Last edited by Loudmouth LS1; May 18, 2005 at 08:11 PM.

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