I really need a refresher course in geometry, did good while I was in it, but didn't retain any of the stuff I was taught
I think I remeber reading something about clearance volume a couple days ago, and IIRC it said to measure it from the top of the piston, and not to include any ridges or dishes, if that's right, then the A-D grooves wouldn't alter the practical clearance volume (although it would affect the theoretical absolute clearance volume). Do you understand that, or have I once again managed to know what I mean and express it in gibberish?