I took the thrust bearing out of a brand new 408 with a real stupid move that I should have caught. To save some time and labor I left the transmission in place and mated the engine to it. I didn't catch a tight fit on my convertor hub in the crank. K1 and Eagle cranks both had an issue years ago with not enough clearance. On start-up it pushed against the thrust taking it and blued two rods and took out the bearing from the trash in the oil. I lucked out with it only needing totally torn down, cleaned, cut the crank, new bearings, honed again, new rings, two rods, and two Diamond shelf pistons. I was about sick in my stomach over that one.