There are several ways you could do it on a lathe. If you have milling attachment for your lathe it would be a snap with a angle plate. I made a angle plate from a heavy 4'' peace of angle iron useing the bolts that hold the cylinder to the backing plate to hold them to the home made angle plate. The machine work from the factory was not real accurate so each cylinder had to be dialed in to get the bore right. Each pass with the boring bar was real light so as not to stress my home made plate and also not get chatter in the bore. I bored them .002" small and honed to the right size and then lapped them in with really really fine clover polishing compound. The new pistons were made to have around .002" clearence.
I did mine on the mill so I could do the boring honing and lapping for each on one set up.
