Good stuff! It's still available in several grades from Rotometals. The alloy GM used in their OEM connecting rods was as hard as woodpecker lips! When I'm boring rods for insert bearings, I can tell if I'm working on an original rod or one that's been reconditioned- - - - -the OEM ones will dull a high speed steel cutter bit, and that's before I get into the steel part of the rod!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!