Numbers help please

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Jan 31, 2007 | 09:22 AM

GD70

Thread Starter

Le Mans Master

Joined: Jan 2007

Posts: 5,485

Likes: 7

From: Peekskill NY

Numbers help please

This is on my block:
3970014- used for 1970-75 I believe
driver's side casting-K675-(Nov,6 1975)?
pass side-TG CON V2 -this I'm not sure about
numbers on front pad are gone from when resurfaced during rebuild.

this what I got off the heads, same both sides-W D12 94 NH S/R 1-052

Thanks in advance!

Jan 31, 2007 | 10:19 AM

427basketcase

Drifting

Joined: May 2002

Posts: 1,546

Likes: 5

From: Sacramento California

Here is a great site to reference all of your numbers.
http://www.mortec.com/

Jan 31, 2007 | 11:01 AM

GD70

Thread Starter

Le Mans Master

Joined: Jan 2007

Posts: 5,485

Likes: 7

From: Peekskill NY

Thanks, I've looked there, and only casting numbers are there, no date or suffix coding. I'll need to check the heads again for the numbers only.

Jan 31, 2007 | 07:12 PM

Duke94

Le Mans Master

Joined: Mar 2001

Posts: 6,640

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From: Ann Arbor Michigan

Here's what your block is. Couldn't find your engine code. Should be 3 letters like "CDH". It would help if you could get the head part number. You will need to pull a rocker cover.

Last edited by Duke94; Jan 31, 2007 at 07:16 PM.

Feb 1, 2007 | 12:36 AM

standup

Drifting

Joined: Dec 2002

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From: New Zealand

Quote:

Originally Posted by GD70

I did some research on the CONV stamping years ago and couldn't find any definitive info about it....so I gave up....reasoning that if it was as important as casting dates and numbers, then someone would have sorted out the meaning by now

The CONV stamping dates back to really early Chev motors and I found this quote from a GM History website:

In 1929, the first incidence of the “CONV-“ mark appeared on the 6-cylinder engines. This mark appeared on Cylinder Blocks and Heads and was repeated in 1930, 1931, etc. However, it appears that not all known 1929 castings have this mark. It is therefore an unsolved mystery [at present] as to what it represents. Inlater years “GM” was also cast in.

So really, the CONV stamping isn't going to tell you anything about your motor.....

As for decoding the rest, try http://www.nastyz28.com/sbchevy/sblock.html

Feb 1, 2007 | 06:18 AM

radiojoe

Instructor

Joined: Sep 2006

Posts: 106

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From: Pullman WA

If you don't want to turn your monitor on it's side...

Feb 1, 2007 | 10:51 AM

GD70

Thread Starter

Le Mans Master

Joined: Jan 2007

Posts: 5,485

Likes: 7

From: Peekskill NY

Thanks guys, I do have the Corvette by the numbers book and did see this page for the casting numbers. It's the TG CON V2 I'm curious about and if this is a 1975 L-82 block, or if not what then. And according to MorTec this block was used from 1970-76.