all i know is its a brand new cast item, so i guess as thick as any other standard compression standard piston, within its set casting tolerances lol

as for why i want to lower it, i kinda got advised to go down this route as i may choose to run 20/21psi high boost, and for reliability and the life of the engine, got told in the long run it would be beneficial to go low comp now whilst the pistons are out, save a strip down if i decide to go down thsi route at a later date