Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9

ls3 valvespring specs

Thread Tools
 
Search this Thread
 
Old Sep 23, 2009 | 01:40 PM
  #1  
Greg Fell's Avatar
Thread Starter
TECH Fanatic
20 Year Member
iTrader: (9)
 
Joined: Feb 2002
Posts: 1,126
Likes: 0
From: Morton IL
Default ls3 valvespring specs

anyone have them handy? how much lift, lbs on seat, open, coil bind etc.
Reply
Old Sep 23, 2009 | 08:14 PM
  #2  
Robin L's Avatar
LS1Tech Sponsor
 
Joined: Feb 2006
Posts: 1,170
Likes: 1
From: Rockfield Kentucky
Default

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
Reply
Old Sep 23, 2009 | 08:40 PM
  #3  
Greg Fell's Avatar
Thread Starter
TECH Fanatic
20 Year Member
iTrader: (9)
 
Joined: Feb 2002
Posts: 1,126
Likes: 0
From: Morton IL
Default

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?
Reply
Old Sep 23, 2009 | 08:43 PM
  #4  
SweetS10V8's Avatar
12 Second Club
iTrader: (4)
 
Joined: Jun 2004
Posts: 2,580
Likes: 3
From: Michigan
Default

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.
Reply
Old Sep 23, 2009 | 08:52 PM
  #5  
Greg Fell's Avatar
Thread Starter
TECH Fanatic
20 Year Member
iTrader: (9)
 
Joined: Feb 2002
Posts: 1,126
Likes: 0
From: Morton IL
Default

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?
Reply
Old Sep 24, 2009 | 11:00 AM
  #6  
Greg Fell's Avatar
Thread Starter
TECH Fanatic
20 Year Member
iTrader: (9)
 
Joined: Feb 2002
Posts: 1,126
Likes: 0
From: Morton IL
Default

ttt anyone confirm for sure? tia
Reply
Old Sep 24, 2009 | 11:11 AM
  #7  
69LT1Bird's Avatar
11 Second Club
iTrader: (1)
 
Joined: Sep 2007
Posts: 2,310
Likes: 6
From: Lapeer, MI
Default

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
Reply
Old Sep 24, 2009 | 11:17 AM
  #8  
Petraszewsky's Avatar
TECH Resident
15 Year Member
iTrader: (28)
 
Joined: Oct 2008
Posts: 895
Likes: 1
From: USA
Default

I believe SweetV8S10 was referring to the Comp 918s
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Sep 25, 2009 | 06:42 PM
  #9  
Spectre86's Avatar
TECH Fanatic
15 Year Member
Liked
Loved
Community Favorite
iTrader: (42)
 
Joined: Sep 2008
Posts: 1,166
Likes: 39
From: Oregon
Default

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
Reply
Old Sep 26, 2009 | 07:33 AM
  #10  
SweetS10V8's Avatar
12 Second Club
iTrader: (4)
 
Joined: Jun 2004
Posts: 2,580
Likes: 3
From: Michigan
Default

Originally Posted by Petraszewsky
I believe SweetV8S10 was referring to the Comp 918s
I was..
Reply
Old Nov 28, 2009 | 10:06 AM
  #11  
SS Enforcer's Avatar
11 Second Club
 
Joined: May 2007
Posts: 226
Likes: 1
From: Sydney
Default

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
Reply
Old Nov 28, 2009 | 11:21 AM
  #12  
69LT1Bird's Avatar
11 Second Club
iTrader: (1)
 
Joined: Sep 2007
Posts: 2,310
Likes: 6
From: Lapeer, MI
Default

LS3 Valve spring specs.

89 lbs closed valve
294 lbs open valve

1.800 installed height
Reply




All times are GMT -5. The time now is 08:58 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE