So if one were available, I would suggest an OEM 80.5mm, but I doubt you will find one. So a Wiseco 80.5mm
As odypilots said, if you send the cylinder to Aftershock, I'm the one who will be looking at it. I would have an 80.5 and an 81 on hand while boring. If it did not clean up at 80.5, then it would get bored to 81.