Reason I ask, John, is that most of the 360 LA truck and pass car cranks and some of the '73-on 340 cast cranks were shot peened, which makes them a bunch more durable than the un-peened versions. I can send you the details when I get home if you'd like to know. The main journals of the 360 crank are also larger in diameter than the 273/318/340 which adds to the stiffness and durability of the 360 crank.
