Just early morning sleepless reading and I saw a thread about re-tapping a 6.9 block to use 9/16 studs and the debate if there was enough meat to do so. It was suggested to not re-tapping a 7/16 hole to 1/2 because there would only be 95% thread engagement. Why not go metric and tap a 7/16 to 13mm (maybe 14mm)? Sure, would require custom studs but I would think 13mm studs would be relatively "uncustom" with all the metric engines today. I also saw it someone suggest re-tapping a 7/16 to 1/2 fine thread but looking at my Machinist Handbook I remember seeing coarse thread is stronger than fine thread.
Anyway, early morning thinking. Thoughts from any real machinists?
Anyway, early morning thinking. Thoughts from any real machinists?