"M" code on Engine Block

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Mar 1, 2015 | 12:04 AM

deejaydu

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From: Blairsville , Georgia

"M" code on Engine Block

Does anyone know what the Letter "M" on the back of the engine means? It is located where the date would be.

Mar 1, 2015 | 01:18 AM

jr9170

Race Director

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From: YANKEES UNIVERSE 70 454-LS5 500 ft-lbs Torque

There arena few threads on here on the M block,maybe someone can post them here.

Mar 1, 2015 | 07:09 AM

BKarol

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Joined: Sep 2004

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From: Northeast

Think all is covered here, starting with page 4:

http://www.corvetteactioncenter.com/...umentation.pdf

My friend wrote the article in the restorer and has collected some data from 69-72 cars. If you would like to share more info I can pass it on. Pm me.

Mar 1, 2015 | 11:48 AM

deejaydu

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From: Blairsville , Georgia

Quote:

Originally Posted by karol

Thank you for posting this information. My forum search did not find anything before I posted this thread. Now I have something else to learn about. If these cars could only talk they would have quite a story to tell.

Jay

Mar 1, 2015 | 08:40 PM

62corvette

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From: Waterford WI

Jay,
I have a base motor automatic 72 that has one "M" head. Engine is untouched with original intake gaskets, etc. if I recall, the number is M114, but I'm away from home for a couple of weeks and don't have documentation with me.
Mike

Last edited by 62corvette; Mar 2, 2015 at 01:09 PM.

Mar 2, 2015 | 12:23 AM

deejaydu

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From: Blairsville , Georgia

Quote:

Originally Posted by 62corvette

Jay,
I have a base motor automatic 72 that has one "M" head. Engine is untouched with original intake gaskets, etc. if I recall, the number is M114, but I'm say from home for a couple of weeks and don't have documentation with me.
Mike

Hello Mike and thanks for your reply. I have to say that I had never heard of this "M" code until yesterday. I have read over the Forum article several times and I am trying to learn what it all means. I did not see anything about the heads but it might apply to them as well as the blocks. If I learn anything else I will post it.

Jay

Mar 2, 2015 | 07:57 PM

deejaydu

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From: Blairsville , Georgia

Does anybody have more that they can add to this topic. I have read everything so far that has been posted.Very good information there. I would like to know more since my block is the documented original to the car and it is a M 44 coded block.

Thanks

Mar 3, 2015 | 09:35 AM

kenba

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From: PHOENIX AZ. WHAT A MAN WON"T SPEND TO GIVE HIS ASS A RIDE

Quote:

Originally Posted by deejaydu

I believe that they were test castings that were samples for new tooling/change of metallurgy ETC. If all was well the blocks were sent to engine machine/ assembly.

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Mar 3, 2015 | 10:19 AM

deejaydu

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From: Blairsville , Georgia

Quote:

Originally Posted by kenba

I believe that they were test castings that were samples for new tooling/change of metallurgy ETC. If all was well the blocks were sent to engine machine/ assembly.

Thanks Ken for the information. That is my understanding as well. I do have documentation from Al Greenings company that references the "M" code and states that it is the original engine for the car. I just want to learn as much as I can about when they were used in production.

Jay

Mar 3, 2015 | 10:21 AM

#10

deejaydu

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From: Blairsville , Georgia

Quote:

Originally Posted by karol

Karol is your friend Gene Gamache. If it is could you please put me in touch with him.

Thanks
Jay
713-253-0475

Mar 3, 2015 | 10:38 AM

#11

BKarol

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Joined: Sep 2004

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From: Northeast

Yes, let me contact him first and send you a pm on the best way to correspond. Great guy

Mar 3, 2015 | 11:07 AM

#12

deejaydu

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From: Blairsville , Georgia

Quote:

Originally Posted by karol

Yes, let me contact him first and send you a pm on the best way to correspond. Great guy

Karol thank you so much. I am looking forward to speaking to him. His article is a great resource. I will reply back to your PM before I contact him.

Thanks for your help.

Jay Dumesnil
713-253-0475

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