What would need to be done to a b16 head in order for it to safely handle 9k rpm's every once in a while?

 

Some aftermarket valvesprings/retainers.

 

thats it? i wouldn't need new valves or anything like that?

 

what he ment to say is basically new Valvetrain/-valves/retainers/springs
the question is ...why rev so high? because if its not tuned and or FULLY BUILT motors stop making power at about 8600 so unless its TUNED/BUILT
you wont be doing nothing reving the motor that high...

 

i'm building an ls/vtec and don't intend running up to 9k rpms but i was basically asking just so that i could have some piece of mind