whats going on evo brothers? I need to replace the valve stems seals on my evo, im running GSC S1 cams with OEM spring and retainers. So my question is are these other valve stem seals GSC, Manley, farrea any better than OEM? or should I stick factory valve seals? what do you guys recommend?

 

I would run OEM unless you have dual springs. I am running supertech dual springs and supertech seals, they are thinner than oem.