Good original pair of 1956 Corvette 265210, 265225 Passenger 265205 HP Cylinder Heads. These will need to be freshened. They are listed as Chevys 1st Hi Performance Heads in the Chevy by the s Book. Part 3725306. Dated H-20-6 Both August 20th 1956. Look like they may have been ported some time in the past.Should fit all 1955, 1956,1957 newer Chevy 265, 283, 327 small block engines.