CRG Discussion Forum

Camaro Research Group Discussion => Decoding/Numbers => Topic started by: HammerIndy on April 30, 2009, 01:38:15 PM

Title: Block #'s...
Post by: HammerIndy on April 30, 2009, 01:38:15 PM

All ,

I could use some help in this same area if you please .
Back of the engine has the cast numbers and letters as follows :
39GM
3970010

Can someone translate these for a new owner please

Thanks

Title: Block #'s...
Post by: JohnZ on April 30, 2009, 02:31:32 PM

3970010 is the block casting number - that block was used from '69 through '79 in many applications. The GM39 is a foundry pattern number. The block casting date is on the passenger side of the rear flange of the block, opposite the casting number. What's stamped on the machined surface on the block in front of the passenger side cylinder head? That stamping identifies the engine type and application.

Title: Block #'s...
Post by: HammerIndy on April 30, 2009, 02:55:24 PM

On the other side is cast what appears to be F207 ( By the distributer )  Can't see anything by the Oil filter
What is stamped under the Alternator is V0207DZ
It has a replacement Trans and I have no idea how to check what heads are on it ?  (I have not gotten around to checking out the Rearend numbers yet but it is a twelve bolt )

ST6912437 NOR360729BDY
TR 711      71   B  PNT
07A           X33D80

Title: Block #'s...
Post by: JohnZ on May 01, 2009, 10:46:21 PM

Quote from: HammerIndy on April 30, 2009, 02:55:24 PM

On the other side is cast what appears to be F207 ( By the distributer )  Can't see anything by the Oil filter
What is stamped under the Alternator is V0207DZ
It has a replacement Trans and I have no idea how to check what heads are on it ?  (I have not gotten around to checking out the Rearend numbers yet but it is a twelve bolt )

ST6912437 NOR360729BDY
TR 711      71   B  PNT
07A           X33D80

Check that casting date again - "F 20 7" would be June 20, 1967, and that's almost two years before the 010 block went into production.

The "V0207DZ" would be an engine assembly date of February 7, 1969, and it's generally agreed that "DZ"-suffixed engines didn't start using the 010 block until April.

If you remove the valve covers, you'll find the head casting number and date; please post what you find.

Title: Block #'s...
Post by: HammerIndy on May 02, 2009, 11:31:51 AM

  F207 is the number by the distributer

On the center of the head are the numbers 1254 cast into a raised pad
under those numbers are                   333882 ( larger numbers )

Is there an easy way to send pics to you

Thanks for your help

Title: Re: Block #'s...
Post by: KurtS on May 03, 2009, 04:33:09 AM

Do you have a pic of the pad? Is it a short or long pad?
This a long pad. A short pad doesn't really have enough room to stamp two sets of #'s.
(http://www.camaros.org/images/pages/decoding/enginepad_V1012FL.jpg)

Title: Re: Block #'s...
Post by: JohnZ on May 03, 2009, 04:05:20 PM

Quote from: HammerIndy on May 02, 2009, 11:31:51 AM

On the center of the head are the numbers 1254 cast into a raised pad
under those numbers are                   333882 ( larger numbers )

Those are 350 "smog" heads with 76cc chambers, cast in September, 1974.