if no dry sump unit then cam stays in for the oil pump to work, oil feed to the head is by tapping line from the side there is a brass block on the side near the top that feeds the A series head, simple mod. However Neil was inquiring on dry sump unit then you would just put in reversed side of the cam bearings to block the holes, common mod for mitsu 4g63 balance shaft removal same process. Does that make sense or the right answer to your query?