safe to install new valve springs?

[oc192]

I have a stock engine with 78k miles on the clock. My buddy has a GN with similar mileage and just replaced his valve springs. He said he gained 60# tq to the wheels after the replacement and swears by it.

I am thinking about doing the same but have read somewhere that you can wipe a lobe on the cam? I have bought the 100 Lb springs from Kirbans but not sure if I should replace them now or wait until I have the engine rebuilt at some point.

 

[turbofabricator]

The 100 lb springs are a good upgrade and will make more power at the upper RPM range. Be sure to add ZDDP to your oil at EVERY oil change and use a good quality oil made for racing. Search "OIL" and you can spend DAYS and DAYS reading up on what everyone preferes. Or save your money and buy a roller cam and be done with it.

 

[ikle]

If you replace the valve springs don't reuse the stock valve spring cups. The Kirban springs have an internal damper so there is no reason to use the cups. I was told that if they are used they act like a shim and create to much spring pressure.