[Bobs29ModelA]

I've read all of the latest suggestions posted in the last day, and, while they're all good suggestions, unfortunately they're also things I'd already checked and/or tried.

I did, however, read an interesting tidbit in my "Model A Miseries and Cures" book. It said that occasionally someone will put a Model B timing gear cover on a Model A engine... and that the timing will be off because the location of the timing pin hole differs between the two covers.

Interestingly, when I first got this car, it was clear to me that someone had removed the timing gear cover at some point, for some reason... because it had been repainted a regular green (not Ford Green) color, and then reinstalled onto the front of the engine. So, I started wondering if perhaps my car fit the description of the same problem I'd read in the book.

Using the book's suggestion as a guide, I did check the position of the timing pin hole and determined that it is indeed the correct Model A cover. Besides that, I've always been visually-checking that the #1 piston is at TDC when setting the timing... and when it is at TDC, the timing pin correctly drops into the notch in the timing gear. I therefore don't think this has anything to do with the problem, especially since it ran for a few days using the same timing and checking methods before...