I have posted this as a short block several months ago with questions about the pistons. Decided to strip it down to the bare block along with another early cast date 068 block today. I'm getting them prepped for sale on our site, but have questions about the date of June 8, 1961. I have posted images of the block stamp as well as the casting date. Block appears to be standard bore. Questions: When did the 068 block replace the 623 block? Any chance this could have been one of the late produced runs of the 142 1961 409's? Likely not the case. When did the 1962 model year 409 hit the showroom? Pistons are GM that have been modified for ......?? Flame travel?? Any old school speculation. Crank is mint. Where are you Pat & Cecil??