[rechinca]

Special-K what I found in lots of downtime reading at work this summer, is those Made In Mexico blocks with the stamping in the head pad that begins with an “M” are untraceable as far as what they went in. They have no partial VIN nor the engine plant / vehicle assembly plant stampings. It is more of a serial number than anything with no VIN. Again that is just what I discovered researching engine stamping/castings. I’ll try and shoot the GM Heritage Center an email just to pick their brains.