They are centered with the bolts, but the spacing is set up for the flywheel to be set in the right position for the silver ball in the flywheel to be used in timing the engine.
If you have holes in the crank for dowell pins, put them in the crank flange. On some cranks they go all the way through into the lower area of the engine. They can be a source of a nasty oil leak under engine oil pressure. Many times they will fool you into thinking you have a rear main seal leak. So be sure they are plugged when you have finished your flywheel work no matter what you do.
Last edited by 6cylindersovertexas; 06/03/13 12:32 AM.
