The main bulkheads are very thin below and between the cylinders.
I've only freshend one of these first hand so what I saw was as mentioned, weak in the web, and deck. I have seen 2 broken ones, and one so poorly machined that the rear main seal top, and bottom could not physically align.The broken ones were in spray use, but nothing a good mega block couldn't have taken (maybe 1400hp). Like without a diaper they could have ran the crank over. Some said it was sub par studs, but the look to me was weak block, in the deck too.
