[ds1]

400 block decks Crack all the time. My best runner had several cracks. The machine shop was not concerned. The Threadsert will go in first and make the deck stable. Then the sleeves will take care of the cylinders. My brothers 73 Corvette had the worst block casting I have seen. It was porus. Looked like black pepper down inside it. When he rebuilt it and torqued the heads all the bolts on the driver side top of the deck pulled out. But it was the OE engine so all the holes were helicoiled and found one of the cylinders cracked. Sleeved the bad cylinder and rehoned the adjacent cylinders because of shift. Way to much work for a two bolt main 350. But the original for his car, number matching.