My 500 would spin over 9000 but that probably wasn't too good for it. I shifted it at 7000-7500 on the track to be "easy" on the motor. We'll see how it likes to rev with the steel rods I am putting in instead of the aluminum ones.

As for the beehive springs, I saw the springs on the Burick Monte works on one day at the track. They are really thin bee hives which blew me away as that thing probably has about an inch of valve lift.