The Tennessee state trade school where I taught auto mechanics for several years had a brand new, never-run 1965 production 409 engine that had been donated by GM when the school opened. We disassembled it once, and found felt tip marker numbers on all the pistons that turned out to be their weight in grams. I had several very tempting offers to take a long coffee break while somebody swapped it out for a worn out 348, but it just wasn't worth risking my job over a couple of thousand dollars! After I left to become a training manager for Sun Electric Co. the engine "disappeared".
Jerry
