Go to the head section of V4 and select the American head morph dial and spin it down to zero and back to .5 and you can see how with this morph the characters head does get larger. You either have to use the matching morph in the hair, or scale to fit. If the hair loads as a figure and not a prop, and you have a recent version of Poser under the parametrs pallet you can select to add morphs on conform option and that will size the hair automatically if and only if the hair has the morph built in.

Gary

"Those who lose themselves in a passion lose less than those who lose their passion"