KENDELL - In all my years of buying castings there's been a LOT of times where a foundry engineer, a single person, makes a change to the gating/risering on a casting pattern and either the casting gets much better or it turns into instant scrap.
Ford used a LOT of nodular iron, remember those awesome 351 Cleveland engines from back around 1969 to 1970/'71. They were the highest winding V-8's made, yeah, yeah, I know the original Z-28 302 was right up there....but the Cleveland crankshaft was ductile/nodular iron.
SON has a pair of 4-bbl Cleveland heads out in the shop now for a future project. Maybe a fun little Ranger p/u.
I wish Ford had never stopped using the 9 Inch rearend, My '78 F-150 had one with Traction-Loc. Seems like every 8.8" rearend I've had has needed repair. Son's '93 Lightning has a "Special" (ohhhh I hate that word!) Super-Duty 8.8, and it still breaks. That's why Gen II Lightnings got the 9.75" rearend.