Small Block Chevy Casting Numbers!

Ever since the Creation of the Iconic 265 Small Block Chevy V-8 in 1955 there has been many variations of this design. With so many combinations of Bore and Stroke, Valve Sizes, Crank Styles and Intakes that were used it is hard to know exactly what you have in your hands at the Swap Meet or while checking those CLAIMED Numbers Matching Auction Vehicles. This has NO connection to a useless app that was offered a year ago.