I double checked the timing with my older analog timing light, same answer. I disconnected the vacuum and put my gauge on it. I use the non-ported vacuum, fyi.
I read up on checking for TDC. I see some people use piston stops with hitting the stop from either side. TDC is halfway inbetween.
I'm going to try something novel. Ran out of time, it'll be a few weeks before I get back to this. I've got an orthoscopic camera that is narrower than a spark plug. i should be able to put that in and watch for the piston to come up to center. We'll see how close I can get.
Eventually, I still need to replace my oil pan gasket. When the pan is off, I can get an exact TDC.
Mark
