"adequate performance" in a dubious early 1960's automotive application isn't the starting point for adequate performance in a 2010's airframe. Not to mention

"adequate performance" in a dubious early 1960's automotive application isn't the starting point for adequate performance in a 2010's airframe. Not to mention the material differences between a machined billet crank and part cast in sand five decades ago, subsequently salvaged and reworked.