I just picked up an old small block and looking up the numbers, the cast numbers and the pad stamp don't jive from what I have been able to research. Would anybody with more expertise, that can shed some light on the situation, be willing to help educate this unenlightened soul? Casting: 3903352 Date: B207 - A 1967 327 2 bolt 4bbl Stamping: T0306HC - Tonowanda - March 6th - HC suffix is either a 1965 327 or a 1969 350 So, I believe it is a 327 as it has the rear breather. Double humps. Really cool #1 team sticker! My confusion is this: how can a suffix for a '65 be stamped on a block cast two years later?.