The pistons are a set of Ross custom for the motor, they have a 22 CC dish and originally where set at -.025 deck hieght, not to the center of the dish . The motor started off as a 4.25 stroke with a set of 84.0 CC ported 906 iron heads and 9.25 to 1 compresion ratio, it is now 10.8 to 1 with s set of indy SR with 76.0 CC and a .042 Cometic gasket. The 4.3 stroke crank ended up raising the piston edges right at zero deck hieght when centered in the bores, they do rock up a little so the edges will measure as high as .007 above the decks If I had to do it over I would use a custom reverse dome piston to get some quench instead of using the full dish pistons like I did, Hindsight is always better than forsight when doing new builds,especially when no one else has done that