Voodoo, yes and no. I may be possible to oring some of them to correct for this but others are too deep and too wide from what Ive seen.
The advantage to oringing a head is that if something is Screwed up down the road a trip across the cyl deck and a fresh head takes care of it. If you oring the cylinder it can be more difficult fix later on and more expensive than just swapping a head out. If the cylinders were bigger at the outer diameter it would be better.