i took my head off a few days ago to replace the head gasket, and me being dumb let my friend keep takin stuff apart for a few minutes when i went to the store, when i got back he had the cams out and i dont know how they were in there, and he doesnt remember...i dont have it marked on the timing belt or anything...how can i put them back in to make sure my timing is still right? is there a trick to it, i never done it befor, but i was gonna mark it on the belt, and he went ahead and ripped them out...plz say there is an easy way to fix this