Which replacement Valve Springs?
Le Mans Master
Joined: Oct 2006
Posts: 5,078
Likes: 19
From: Cumming, GA
Because two is better than one for insurance in my opinion. If a single spring breaks thats a wrap for that cylinder where as if one coil of a dual breaks you have the other there as a back-up.
When I snapped my timing chain we found three of the dual springs broken. Because they were duals only the inner coil was broken while the other was still holding the valve in place. Thank goodness!
When I snapped my timing chain we found three of the dual springs broken. Because they were duals only the inner coil was broken while the other was still holding the valve in place. Thank goodness!
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
Because two is better than one for insurance in my opinion. If a single spring breaks thats a wrap for that cylinder where as if one coil of a dual breaks you have the other there as a back-up.
When I snapped my timing chain we found three of the dual springs broken. Because they were duals only the inner coil was broken while the other was still holding the valve in place. Thank goodness!
When I snapped my timing chain we found three of the dual springs broken. Because they were duals only the inner coil was broken while the other was still holding the valve in place. Thank goodness!
In some of the race engines with solids we would run a triple, but that is a very extreme case.
FYI, the race engines get new springs roughly every 30-40 hrs run time.
Former Vendor
Joined: Apr 2006
Posts: 2,470
Likes: 2
From: Portland OR
St. Jude Donor '10-'11-'12
Its a safety factor but it also comes down to the lobe/cam profile and application.. singles are used very successfully through out as well (depending on the aplication)... you need to match the valvetrain up .. not pick stuff and throw it together.. lifters are part of the equation as well.. its the well thought out planned valvetrain that doesnt have issue. A quality spring certainly helps and I was talking to PAC about failures and what they see.... One thing they liked to point out:
Some times its who ever installed them... maybe a person scratch or nicked a spring.. they will break on the scratch...
*as a side not how many people other than shops actually check install heights?
Some times its who ever installed them... maybe a person scratch or nicked a spring.. they will break on the scratch...
*as a side not how many people other than shops actually check install heights?
Drifting
Joined: Dec 2005
Posts: 1,720
Likes: 3
From: East Hampton CT
My "back up" springs allowed my car to run for thousands of miles, spreading chunks of metal throughout the motor. If I had a single spring break, I would have known the issue immediately and been able to troubleshoot and resolve. Because my outers were still good, my inner springs broke apart and went everywhere in the motor, but the car still ran fine and didn't tick so there was no reason to rip it down or check springs visually.
The theory of dual is great, for my situation, I would have rather bent a single valve vs trashed the entire motor and every bearing in it due to spring pieces flying everywhere....I ended up buying a LS2 because my LS1 was so worn
The theory of dual is great, for my situation, I would have rather bent a single valve vs trashed the entire motor and every bearing in it due to spring pieces flying everywhere....I ended up buying a LS2 because my LS1 was so worn
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
I had great luck for years with Patriot Golds. But I will admit when I put on my used AFR heads they had nearly new comp 921's on them, and the car is quieter. I actually posted a vid on my youtube page of the engine, it's really quiet now.
I'm not sure if the new heads put a little more preload on the lifters, or if it's the springs, however.
IMHO comp is the gold standard, but the patriot golds are very good for about 1/3 the price.
I'm not sure if the new heads put a little more preload on the lifters, or if it's the springs, however.
IMHO comp is the gold standard, but the patriot golds are very good for about 1/3 the price.
Tolero Apto Victum
Joined: Jul 2007
Posts: 9,669
Likes: 37
From: Woodlands TX
I have over 77,500 miles on my heads and cam with NO problems with their springs. You can not go wrong with them, IMO.
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Verdad Gallardo
"AlohaC5" Senior Member
Joined: Jun 2003
Posts: 3,562
Likes: 44
From: Madison, AL
It's a smart move to upgrade from a single to a dual valve spring when you start installing higher lift cams and running them at high RPMs.
I went from the Patriot Golds in my LS1 - to Comp 921s in my stroker LS6 - to the 'best' PAC 1521 in my built LS2 with a .620+ lift cam.
The PAC 1521 are the only springs I'll use based on my personal experience and recommendations from engine builders and tuners.
I went from the Patriot Golds in my LS1 - to Comp 921s in my stroker LS6 - to the 'best' PAC 1521 in my built LS2 with a .620+ lift cam.
The PAC 1521 are the only springs I'll use based on my personal experience and recommendations from engine builders and tuners.
Last edited by Gray Ghost GS; Mar 2, 2012 at 09:50 PM.
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
That is another very good point, which is why we suggest the 921's with our cams as we did work with Comp for a long time to find a proven spring that will work with the lobe designs throughout the RPM range...not just to a rated lift.
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,151
From: SW Florida
2021 C6 of the Year Finalist - Modified
Comp Cams P/N: 26925 Dual Valve Springs. Can be had for as low as $200 for the set of springs only.
Drop in replacement for the stock single "Beehive" springs.
Designed to fit the stock valve spring pocket (without machining) and stock valve length.
Good for lifts up to .650"
2011 GS .. LS3
______________________________
EDIT: How the Comp Cams 26925 differs from the Comp Cams 26921 as recommended by LG Motorsports, I don't really know ... Both are dual springs, and both support up to .650" aggressive lift profile cams.
.
Drop in replacement for the stock single "Beehive" springs.
Designed to fit the stock valve spring pocket (without machining) and stock valve length.
Good for lifts up to .650"
2011 GS .. LS3
______________________________
EDIT: How the Comp Cams 26925 differs from the Comp Cams 26921 as recommended by LG Motorsports, I don't really know ... Both are dual springs, and both support up to .650" aggressive lift profile cams.
.
Last edited by Turbo6TA; Mar 4, 2012 at 02:37 AM.
Le Mans Master
Joined: Mar 2010
Posts: 7,052
Likes: 945
From: DFW TX
Comp Cams P/N: 26925 Dual Valve Springs. Can be had for as low as $200 for the set of springs only.
Drop in replacement for the stock single "Beehive" springs.
Designed to fit the stock valve spring pocket (without machining) and stock valve length.
Good for lifts up to .650"
2011 GS .. LS3
______________________________
EDIT: How the Comp Cams 26925 differs from the Comp Cams 26921 as recommended by LG Motorsports, I don't really know ... Both are dual springs, and both support up to .650" aggressive lift profile cams.
.
Drop in replacement for the stock single "Beehive" springs.
Designed to fit the stock valve spring pocket (without machining) and stock valve length.
Good for lifts up to .650"
2011 GS .. LS3
______________________________
EDIT: How the Comp Cams 26925 differs from the Comp Cams 26921 as recommended by LG Motorsports, I don't really know ... Both are dual springs, and both support up to .650" aggressive lift profile cams.
.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
^^ That price has to be for the springs alone. With the Patriot kits you get the springs, titanium retainers, new vitron seals, and keepers for around $250 last I checked. The similar comp setup was around $800 IIRC. My prices in my mind are a couple of years old.
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,151
From: SW Florida
2021 C6 of the Year Finalist - Modified
Thread Starter
Pro
Joined: Mar 2010
Posts: 701
Likes: 2
From: Lewisville TX
Well my cam has EPS lobes since it was done by Patrick G. I have the specs somewhere,. ill see if i can find them.
I do track days and i run third gear high a decent amount of the time just the way the track i usually go to is set up. I use fourth too, but third goes through the whole range depending on how things are going.
I do track days and i run third gear high a decent amount of the time just the way the track i usually go to is set up. I use fourth too, but third goes through the whole range depending on how things are going.
Burning Brakes
Joined: Dec 2007
Posts: 1,249
Likes: 31
From: Dyer IN
Burning Brakes
Joined: May 2010
Posts: 968
Likes: 3
From: Coplay PA
Your theories about these dual valve springs are totally bogus. It does not matter if you have a single or double. Either way if they break, you will have a problem. There is no re-assurance with dual springs, I'm so tired of seeing people say that.
