340 Chugging instead of Reving

1969GTS340 said
I can definitely measure the lift of both valves at that point. I was considering to use dial indicators to be more exact.
One correction to all of this is.. I was looking at overlap with the crank 180* from TDC. I understand that was in error, and it should be 360*. When I did that, both valves were lifted.

Yeah, my bad. I said 180 degrees and I should have said 360. If both valves are off the seat at overlap it’s straight up.

If the timing light doesn’t quit blinking when you’re using it, it’s not the timing light.

The Mallory stuff is far less sensitive to timing lights than the MSD **** is.