The pistons are in the engine - so this is the best I can do. They are flat-top, with a .040 squish to the head, the radius is done by hand and then I balance the pistons to the same gram weight. The radius on the leading edge follows the shape of the relief - a bit of an angle (notice that it is clocked off of straight up - four pistons go one way, four go the other way.
Also, keep in mind the level of porting in this block (extreme) and the port sizes are a whole lot bigger than a Ford. Both intakes and exhausts exit out the top - the exhausts don't "snake" through the block like on a Ford. All in all, a much better flowing design (and bigger cubes) than a Ford. BUT - not easy to design, build and work on.
I moved the ring pack down for this iteration of the piston design (as it is blown and under quite a bit of boost) - we're running metric rings (which is all I run if I have a chance).
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