What exacly is needed in my top end to higher my rev without hurting my motor? Iv herd upgrading valves spings and retainers...is that what i want? I want to higher my rev without hurting my motor. I have a 2000 gsr with je pistons, eagle rods, arp head studs. 9 to 1 comp ratio built for low boost. Is there a kit i can buy with eveything i need??

 

for high rpms your going to need cams retainers and valve springs, some people go overkill and replace the valves them selves. but check out skunk2 they usually have kits for a whole valvetrain upgrade.

 

Nice ok. and how much more rpm will this let me be able to go? another k?