10. Fredrick mocks up the bellhousing one more time to ensure the opening is centered in line with the crankshaft’s pilot bearing. This is a quick task with a dial indicator on a magnet mounted to the flywheel. Check at four points on the bellhousing 90 degrees apart from each other. If the bellhousing is off by more than a few thousandths, the problem is often with dowel holes in the block. The best fix is to use a set of offset dowel pins.