Sorry, I meant that they're all quench (part of the chamber surface is flush with the gasket surface), and the bore isn't completely exposed at TDC. An example of a wedge chamber with inclined valves, but open chamber is the Chrysler B/RB 906 and 452.
Except for intentional smog (like these), some 2-strokes, and some hemis, closed is pretty much universal (and mandatory on sidevalves). All 4 valve and pent-roof I can thick of are closed, although the "closed" sections are really small.
