Full set of used diamond racing forged dome Pistons 4 rights and 4 lefts  +.030 400 small block Chevy 4.155 bore 6" Rod CR is 13:1 with 64cc chamber heads, 3 3/4 stroke that makes 406 CI, uses 1/16,1/16, 3/16 piston ring set. This is a used set and they do have a few small dings in them here and there (see pictures) but very useable  includes pins and used spirolox cleaned and ready to use