Greg;
Take the advice of others. Using a bent valve is a mistake. Seating it is
only half the problem. Once bent it caused other damage. Piston, maybe
rings, the reason you bent it was most likely the chain and it went out of
time. If it wasn't out of time then one of the rods gave and the piston
touched the valve before it had a chance to close. Guides get loosened
causing leak by and as some one else already said it could snap off in the
engine and oops, there goes another piston. Believe me, it's not worth the
effort.
Bill