Another trick my engine builder likes to do is use a 351W firing order instead of the 289 firing order. The 289 firing order creates more stress on the engine block.
I never heard that about the block, just late production ('67ish) broken crankshafts. It wasn't about race engines. It was about warranty replacements on production cars.
I never saw that. Neither did I see main bearing failures on 351c's but Ford said yes.
I can see where running the engine out of oil caused the bearing issue but broken crankshafts? How do you do that?
Ford thought they might have an oiling issue with the C's and put 20-50 oil in the B351's.
The 289 crank has to be a casting issue? I never even heard of a racer breaking one. Spun bearings, yes.
The firing order on the 5.0's was changed to the 351w firing order somewhere around 1981. So what took so long if there was an issue? The small block was in production since 1961. It doesn't make sense unless they felt the weaker roller block needed it?