Hi Guy's

Thankyou for all your repiles on changing a cam-belt on a Subaru Legacy GT.
I have a another qustion for you guy's, when i change my cam-belt i also need to do one of the cam seal on the right side of the car looking from the front.
Is it ok to take off the pullies to change the cam seal!!! i have been told that if you dont clamp the pullies the cam's can move and do some damage to the vaules and head!!
is this true!!! and how do i get around the problume!!!!