FBO plate over advancing
Here is how I check mine on the bench. I printed 7" degree wheel, I cut a small pie shaped section out of it, and put a hole big enough for the rotor to fit through snugly, so it won't easily slip. With the shaft of the distributor in a bench vice, put the rotor with the degree wheel in place in /he top of the distributor. Spin the body of the distributor so that one of the locking tabs is lined up with the degree wheel. Now holding the body, you can rotate the rotor until it stops, and measure the amount of advance you have. It won't move much, but it doesn't have to, whatever you have at the distributor doubles at the crank. For example 8 degrees at the distributor is 16 at the crank. It's easy to make, and will keep you from installing the distributor over and over. I would have thought there would be something like his available, but I have never seen one.
Here is how I check mine on the bench. I printed 7" degree wheel, I cut a small pie shaped section out of it, and put a hole big enough for the rotor to fit through snugly, so it won't easily slip. With the shaft of the distributor in a bench vice, put the rotor with the degree wheel in place in /he top of the distributor. Spin the body of the distributor so that one of the locking tabs is lined up with the degree wheel. Now holding the body, you can rotate the rotor until it stops, and measure the amount of advance you have. It won't move much, but it doesn't have to, whatever you have at the distributor doubles at the crank. For example 8 degrees at the distributor is 16 at the crank. It's easy to make, and will keep you from installing the distributor over and over. I would have thought there would be something like his available, but I have never seen one.