Here's the measurements for a valve...
Pic 'stolen' from www.ferrea.com
they make some kick ass valves for honda- check em out for all you na guys wanting to redline at 12321321 rpms
![Custom_Valve_Order_Form2.gif](/proxy.php?image=http%3A%2F%2Fwww.ferrea.com%2FCustom_Valves%2FCustom_Valve_Order_Form2.gif&hash=1b489313b452f65ba2c7c122cf9d076c)
Pic 'stolen' from www.ferrea.com
they make some kick ass valves for honda- check em out for all you na guys wanting to redline at 12321321 rpms