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"M"-Coded Blocks There is one exception to the normal block casting date convention that has been observed: some blocks have been seen with "M" cast codes. Research by the Saginaw Metal Casting Operations of GM Powertrain Division has found that these "M" codes are not date codes, but actually a foundry code used to indentify parts that were made to evaluate a casting process change. After evaluating the parts, the blocks would either be destroyed or released into production. There is no way to determine the date an "M"-coded block was poured.
Hmmmm id definately love to keep the 327 aswell, but I measured the stroke and it's slightly more then 3.5" so now I'm not sure what I've got again. Lol. I guess I'll pull the pan off when I get some time and see. I have to strip it down to send off to the machine shop anyways. The cylinders are inaccurate but there's a small ridge at the top of each cylinder so I'm hoping I can go .30 over and it will be enough.