You don't have to have a special tool to measure the depth. If you have good eyes you can get a very close estimate with a good scale (machinist ruler). If they are stock they will either be .030", .060" or maybe .100" in the hole depending on if someone replaced the piston before you got the car. The pistons could have been replaced with anything including dome pistons. If you don't have a depth mic or some digital or vernier calipers you can use a scale (graduated machinist ruler). I used to be able to measure with .010" of an inch in my younger days using a machinist scale!! Now I need a seeing eye dog just to find my butt:rofl:
treblig