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186 Heads date code
Looked at a 1970z28 for a friend with 186 heads dated M 12 2 and M 12 1 , car is all original ,owner history from new , They all say never replaced , cant make sense of the
M date for month , car is late April built , any thoughts , thanks Last edited by rm70z; 04-04-2022 at 05:56 PM. |
#2
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http://www.camaros.org/drivetrain.shtml#BlockCast
'M' was not a date code. It was a casting code that indicated the part was made to evaluate a casting process change.
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Learning more and more about less and less... Last edited by William; 04-04-2022 at 07:14 PM. |
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Thanks Bill & Kurt, I was looking for a thread I started in 2004 which John Z. confirmed what is stated on the CRG:
"M"-Coded Blocks There is one exception to this 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.
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Steve Shauger The Supercar Registry www.yenko.net Vintage Certification™ , Providing Recognition to Unrestored Muscle Cars. Website: www.vintagecertification.com |
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