Ok You need to remove any bolts, or sensors that are in the head (exhaust studs are ok to leave in) Clean the head with the brake clean, concentrate on the valve spring are and oil breather area. Once dry, then bag the heads making sure that if there is no oil left in head as it will not leak out of the box. If it leaks UPS has a bad habit of stopping the package and waiting to see what is in there, this can be approximately a week before they will release the package, after they re-box it and charge you for the service.