This is a used original engine block from a 1961 Cadillac. This will fit all 1961 Cadillac's, and could be used for other years as well, but please make sure it will fit your application for yourself before buying. This had been professional cleaned / hot tanked and magna fluxed for cracks at a machine shop and is good ! No cracks !!! The bore are the original size, it has never been machined, still original stock size. We are sure you will want to bore it or machine it before use again as it is used and has some minor rust and marks in the cylinders, nothing major and no big ridge at the top. This is a good used original block. We are selling this as a core unit for repair / rebuild before use. This will need to be shipped truck freight on a skid/pallet, please contact us for a quote before purchase, Comes as shown, Sold As Is. Please let us know if you would like any other info. Thanks