What do you call the webs where the main cap bolts go, between the insert saddle and the oil pan rail? As far as the stress on the center main, look at the firing order and see how many combustion cycles hit that one in one revolution. The reason why Ford had a different firing order for the old 302 to the 351 windsor and the later year 302. Chevy changed from the old 18436572 to the later LS and Gen V BB with the 4/7 swap to move half of the load to the front and rear mains.
