After nearly a year of development & tweaking we're proud to announce that the all new Precision Race Components LSx spring kit is now available!

This valve spring is the result of countless hours of testing and comparing to both the previous versions of our springs along with several other competitors valve springs. (some of which cost over $500 per set)

The goal was to develop a valve spring that offers increased pressures & lift capacity for the newer more aggressive LS camshafts that are currently being built.

While the previous version LS spring that PRC & so many of our competitors have used for years is a great spring, it's simply a several year old design that wasn't built specifically for the camshafts being produced today.

A few of the goals we wanted to accomplish were:
Increased Pressures
Increased Lift Capacities
Much Longer Spring Life
Higher RPM Stability

The new PRC spring kit is built out of a EHT Chrome Silicon with special processing that helps to provide us a spring life that testing has shown to be well over 3 times the life of any LS spring currently on the market! Testing has shown that after 20,000,000 cycles this new valve spring lost 1% pressure @ the seat & open!!

The new spring checks:
1.800" = 161lbs
1.150" = 472lbs

The spring coil binds below 1.080" allowing for nice lift capability!!

The EHT Chrome Silicon valve spring material allows for well over 3 times the life of our previous double spring.

Inner & outer springs who's individual & combined harmonics were carefully studied in a effort to create a spring who's harmonics allow for heavier after market rockers as well as much higher rpm ranges while maintaining valve-train control!!


While the valve spring is designed for hyd. applications, we recently tested a set of the springs installed on a 416ci LSx using PRC 237cc heads & a .708" lift solid roller camshaft. While this combo through the FAST intake doesn't show off the high rpm abilities of this new valve spring, it clearly shows that the spring can easily handle some pretty wild applications. I have dyno sheets of the spring controlling the .708" lift spring on a 2.100" stainless valve well past 7400rpm. While this is well out of the range of intended use, it shows how truly versatile this valve spring is.

The truly beautiful thing about this new spring package is that at $350 a set they're only slightly more expensive than the standard PRC double spring, and over $200 a set less than it's nearest competitor that supposedly uses the same material! For basically $75 more than the current PRC spring you get a spring capable of running 2-3 times the life of the previous gold/platinum valve spring!!!

In a effort to offer the most complete line of products for our customers, we will continue to offer the standard PRC Platinum Spring Kit for budget minded customers. We're also currently working on a beehive single spring that should be ready to go in the next couple of months!

Now for the pics & one of the dyno sheets from the solid cammed 416 with PRC 237 cylinder heads!

 

So when you say they're available, does that mean they're ready to ship today? If so, this is great news.

 

great news! does the head need to be machined for use of springs set?

 

Yes, there are a handful of these kits already sold and leaving today. And there are MANY more ready to ship as soon as they are ordered.

 

It's a drop-in replacement. No machining required.

 

What's the max recommended lift on a hydro setup?

 

Ding Ding Ding! Winner!

We've got this kit rated at a max lift of .675". Of course you should still setup the installed heights according to your specific cam/head combo, ensure stability in the valvetrain by using quality rockers/valves/lifters/ etc, just like you should with any spring kit you install!

 

i mustve missed that part.
def. considering for my new project.

 

What is the max rpms the springs are rated at.

 

Question: Any testing to show if these springs will work fine with larger 2.16-2.19" stainless valves found in L92 and LS7 heads with aggresive .670 lift camshafts..

 

What is the retainer material in this kit?

 

The retainer is titanium much like the other PRC spring kits, just in the right dimensions for only this spring sizing itself.

 

would this spring be fine with a solid roller 248/248 @.050 .625/.625 lift ?? i could shim them some too??

 

Boosted it should work just fine in that application. I wouldnt expect you to need shiming.

 

SoCal if the valve in a L92 or LS7 is solid stainless I might try to shim them & keep them at a little bit less lift. I believe the spring could probably do it, but better safe than sorry. I'll let you know shortly how many rpm the spring can take the stock L92 valve & stainless ls7 valves next time I'm on the engine dyno. With the way the spring resist pressure losses even with the 20,000,000 cycle testing I think it will hold up extremely well even with the heavy valves.

 

too bad I couldn't get these springs when I installed my tsunami 3 weeks ago

 

ok, probably a silly newbie tech question, but i will ask anyway...

When swapping out springs, do i need any special tools or anything like that? I plan on swapping springs soon, and these look like a good choice. So when i do order these, i plan on doing it at home woith the help of a buddy. IS it hard to install springs? are any special hardware or tools needed?

 

I would suggest starting a new post asking any details and questions regarding whats needed for valvespring installation etc and we can keep this topic to discussion about these new valvesprings.

 

alright, fair enough. I just figured it would be a simple 1 sentence answer. Anyway, good luck with the springs. When it comes time to change my springs (pretty soon), i will be checking the feedback on these, and if it is good i will order some.

best of luck.

 

You'll need the ability to pressurize the cylinder you are changing the springs for so that the valves do not fall when you remove the springs. Also, a good spring compressor tool (Crane is my preference if you can still find one anywhere) is a good investment over the cheap tool that Autozone sells/rents.