11. Align Honing - Align honing the crank centerline ensures that the main bearings and crankshaft race have a perfectly aligned and concentric path for the crank to spin inside. Align boring—different from align honing—should only be done if measurements determine it is absolutely necessary to achieve alignment and concentricity. Align boring requires the main caps to be cut, so the resulting bore operation causes the crank-to-cam centerline distance to be slightly less. This necessitates an undersized timing chain, which may or may not be available for your engine family. Align honing is preferred, and gets the job done 99 percent of the time.