Don,
When I worked at a race engine cylinder head company, I had to make an adapter for a flow bench. I turned a step on a large tube and also the mirror image of it in the bore of a large flange. Essentially, it was tongue and groove. There was a .010" interference in that big adapter. It was all aluminum and about 5" dia at the fit line. When I heated the flange and froze the tube, there was a visible sloppy fit when assembling them.

Last edited by Chuck H; 01/11/13 04:41 PM.