Just did a top end re build on my d16y8 : Crower springs and retainers, valve job and head milled down because it was warped. Arp head studs and full street pro cometic gasket kit. Kept the bottom end all stock with 227k miles. Yes I broke the top end in and i know i should have refreshed the bottom end. Motor had full amount of oil. I was going down the highway at 65 mph 5th gear and the rod went through the block. Whats everyone think the reason why the rod went??