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ls3 valvespring specs

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Old 09-23-2009, 01:40 PM
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Default ls3 valvespring specs

anyone have them handy? how much lift, lbs on seat, open, coil bind etc.
Old 09-23-2009, 08:14 PM
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They are the same as an LS6 and the LS2.

IIRC they are good to .570 lift

I would need to look up the pressure.

Robin
Old 09-23-2009, 08:40 PM
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Thats enough for me Robin, thanks. I know exactly which springs they are now.

It looks like the 918's from comp are no longer rated at .650. Whats the deal there? What other options do you guys know of?
Old 09-23-2009, 08:43 PM
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There rated to .625", Im running them at .621" lift right now and had to shim every single one of them still to get them where I wanted them.
Old 09-23-2009, 08:52 PM
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Originally Posted by SweetS10V8
There rated to .625", Im running them at .621" lift right now and had to shim every single one of them still to get them where I wanted them.
Really? Is this a different part number than the ls6/2? FYI I'm wondering for an 2010 camaro ls3.

i'm 99% sure the ls2/6 springs weren't good to that much lift...am I dreaming?
Old 09-24-2009, 11:00 AM
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ttt anyone confirm for sure? tia
Old 09-24-2009, 11:11 AM
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From the GMPP catalog

12586484
Valve Springs (not shown)
• Beehive style springs • Standard LS6/LS3 springs
• Use cap P/N 10166344 • 1.250" @ 295 lbs. pressure
• 1.800" installed height • Max lift .570"
@ 90 lbs. pressure
Old 09-24-2009, 11:17 AM
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I believe SweetV8S10 was referring to the Comp 918s
Old 09-25-2009, 06:42 PM
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Originally Posted by Greg Fell
Thats enough for me Robin, thanks. I know exactly which springs they are now.

It looks like the 918's from comp are no longer rated at .650. Whats the deal there? What other options do you guys know of?
I think the 918s are rated at .600 and the 921s are rated at .650
Old 09-26-2009, 07:33 AM
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Originally Posted by Petraszewsky
I believe SweetV8S10 was referring to the Comp 918s
I was..
Old 11-28-2009, 10:06 AM
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So a custom hotcam grind with 218 550 550 112 would slip into a ls3 without a springchange ?

I don't care about skimping out on springs but want a light valvetrainand not bash the hollow valves around with heavy duty double springs
Old 11-28-2009, 11:21 AM
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LS3 Valve spring specs.

89 lbs closed valve
294 lbs open valve

1.800 installed height



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