I'm building a 9.0 deck block with a 4.185 bore 3.70 stroke. I had Diamond make me a set of pistons. I had special valve pockets machined. Diamond made them with no problem and the price was reasonable. W8 raised seat takes a deep seat. Brett Miller gave me a piston number with the correct seat and they used that with my other specs. to make the set. Worked out perfect. I can give you the piston number if needed. They came with Total Seal rings that are readily available.