This is a very old thread but I am digging it up because I have seen with my own eyes some old paperwork related to the ZL1 block mostly. It is an old paper file and I know the original source. It is legitimate GM prints and various internal notes. Most of it is from the early 1970s. I have not had the opportunity to look at all of it yet but may get a chance to look at it again soon. I believe the person who currently is in possession of it may be interested in parting with it if it was s worth their while. It looked to me like most of it was related to block 3946053 but it also looked like there were other part numbers in the file as well. Does anyone on here have any insight into the historical or monetary value might be?
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