70 Block Casting Date

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Jul 31, 2018 | 07:29 AM

coznocoz

Thread Starter

Intermediate

Joined: May 2014

Posts: 43

Likes: 1

70 Block Casting Date

Have a 1970 Roadster with a Casting # of 3970010 with a Casting Date of M108. M108 does not equate
to a normal Casting Date. Can anyone decode the casting date?

Thanks

Jul 31, 2018 | 08:00 AM

Hammerhead Fred

Melting Slicks

Joined: Mar 2005

Posts: 2,093

Likes: 297

From: Midlothian VA

Quote:

Originally Posted by coznocoz

Have a 1970 Roadster with a Casting # of 3970010 with a Casting Date of M108. M108 does not equate
to a normal Casting Date. Can anyone decode the casting date?

Thanks

Try following your original thread. https://www.corvetteforum.com/forums...ting-date.html

Jul 31, 2018 | 08:25 AM

toylman

Burning Brakes

Joined: Dec 2006

Posts: 978

Likes: 254

From: Bethlehem, PA

Quote:

Originally Posted by coznocoz

Have a 1970 Roadster with a Casting # of 3970010 with a Casting Date of M108. M108 does not equate
to a normal Casting Date. Can anyone decode the casting date?

Thanks

Engines with the M code are "test" casting blocks. This is not a date code. I owned a '72 with a M code engine and tried to figure it out myself. That car is now owned by another member of this forum. The best explanation is done by Gene Gamache with an article titled "M was for Mystery". Scroll down the attached pdf to read his article.
https://www.corvetteactioncenter.com...umentation.pdf

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