At this point in time you're gonna need to do the machine work. If it were me, I would exchange or return these. There are others that will do a better clearance jobs with no hassles and no pushrod change overs, etc. My real concern is push-in stock studs. They will pull out of the head and under rpm load, the studs are not as sturdy (flex) and have a tendency to break. I would recommend machine work in almost all cases of trying to achieve your goal.