One set of 8 Sealed Power 235NP30 .030" over bore cast aluminum flat top pistons for 1957-1967 Chevrolet 283ci small block V-8 engines having a 3.905" bore size.  The pistons were ordered in for a customer and we changed plans on his engine and did not use these.  I did measure the piston skirts for size and they are all good.  Please contact me with any questions.