[dataway]

I once had a very, very reputable F1 level machine shop bore a vintage motorcycle race engine for me. These engines are steel sleeved aluminum blocks. I neglected to ask them to use a single point boring head ... they spun the liner in the block. Not really their fault as this particular engine was known to have fairly loose liners. Problem was, the liners have a big step/flange, which is notched for the head bolts so it would have to be pressed out and back in the right place. By which time clearance usually opens up enough that you lose too much heat transfer to the block walls.

Luckily these cylinder blocks were a dime a dozen