i hate to be a post *****, but i forgot to ask this .,...

i am using a smaller pulley on my Z6
the other pulley its about 1/2 inch smaller in diameter...
was wondering if the smaller size is going to affect the timing on the car when i time it... doesnt the mark runs farther than the stock pulley?? or doesnt this affect timming at all.... a local shop told me it doesnt, and another mechanic told me it does matter. mroe opinions please....