Quicktime bellhousing install
What you are doing is taking a dial indicator with a magnetic base putting it on the flywheel with the guage plunger on the bellhousing opening. You zero out the guage, rotate the engine until the guage reads its highest reading in the opposite direction. If its .010 or less than your run-out is =>.005" and is good. If its more than you need off-set dowels in the direction its off.
You will also take measurements at the 12 to 6 (up/down) and 3 to 9 (Left to right).
In my case when I measured mine, I was at .005 left to right (within spec), but .010 up to down (out of spec). Which based on if the reading moved neg or pos determines if the bell needs to be moved up or down to be within .005". If you see off-set dowels, the most common is .007" and .014". Since .007" is closer to .010" than .014", use the .007" dowel pointing down to move the bell down .007". This will correct it to .003".
Make sense? Youll understand when you put a dial indicator on it and rotate the engine over.



