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!

 

Nice work guys.