bouncing timing mark

I run a .509 in a big block and my timing at 800 RPM only jumps 2 degrees so somethings sloppy. To check to see if the balancer outer ring is loose and bouncing around try this. With engine at idle, use the timing light to capture the balancer looking at it from underneath and figure out which part of the balancer face you can see the easiest. Shut the engine off and rotate by hand till the part that you'll be able to see is at the bottom. Then paint (I use my wifes white nail polish) a 1/8" wide line that starts at the outer ring and extends all along the face of the balancer, use a ruler it's got to be straight. Start the engine up and using the timing light on the face of the balancer to see if the line is breaking at the margin between outer ring and inner hub, right where the rubber is. If your timing is moving 6 degrees and the balancer is the culprit you should see something.

Terry