You put the block together and every thing seems fine. The rods hanging out appear crooked but you put the jugs on and they have a little bind. Now when the heads are tightened down the cylinder has to seat straight. In your mind you think WOW what great compression . You need a diesel starter just to spin it! Later after driving it, all that bind wears into place like cylinder walls, wrist pin bushings, main and rod bearings, thrust cut, and now the as the flywheel has worn it's way over, it scrapes metal out of your bell housing. The best tell tale sign when you pick it up at the shop is, look where the boring tool left one side of a bore bright silver and the other side untouched. Your pulley will have to be beat into the block just to get it on.