well if you port and polish it then you would need new valves right??? i'm not too sure but even if you use all high end parts on that head you wount raise the red line very much so i guess the stock valve springs should still be good for this.
It's not about raising redline (which you could actually do easily by modding the valve train), it's more about having a better flowing head. A high redline doesn't help if you have a lower power band peak.chronoti said:well if you port and polish it then you would need new valves right??? i'm not too sure but even if you use all high end parts on that head you wount raise the red line very much so i guess the stock valve springs should still be good for this.