Can't offer any help from experience except to answer your question about the four stroke design; each of the four cylinders fires once every two revs, meaning two of them fire every rev.

You can get a lighted USB inspection camera for under $10 these days good enough to poke through a plug hole. I've not used it on a cylinder, just through an oxygen sensor bung to see the catalyst. Not sure what you might see with one anyway.

On an AW-7X (240 trans) there are two removable screens at the bell housing from which you can see the tone ring at least; not sure what sort of transmissions 700 cars may have. Too cold to be under the car now, and you might even have caught some of that last snowstorm.

--
Art Benstein near Baltimore

I was going to wear my camouflage shirt today, but I couldn't find it.