what is the smallest crank pulley i can get for a silver top zetec as the one on it sits on the steering rack thanks in advance

Hmmm! unless I am much mistaken you cannot change for a smaller pully, as it will bugger up the valve timing, the bottom pully and the cam pullies are a set, if you measure the bottom pully it will be exactly half the diametter of the cam pullies. Cheers Ray

No you can get under-run pulley's. Its seperate to the valve timming pulley.

Its a dual mass pulley. There are a few places that can suply or make one for you inclueding flak monky on here.