if its tight it will make a noise the more u rev it i was alway told when the cars cold u should be able to twist the cam belt 1/4 of a turn on it longest point if u no what i mean.
in your case from bottom pulley to th cam is the longest point take hold of the belt 1/2 down and see if u can twist it 1/4 turn that what i was told by a bloke that works at ford but im sure sum1 on here will say otherwisw good luck