I have done a couple of air cooled cylinders, that had iron liners.Welded in a bridge, honed the thing true then dropped in an alloy liner.
This makes it possible to fully weld the liner in around the top, and then down both sides of the bridge to get good heat transfer.
I also welded around the junction of the transfer ducts and the bore edge, ensuring that the liner stayed true.
Once the porting was done, it was then plated, still running many years later.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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