BB decoding help

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Jan 26, 2011 | 10:11 AM

MarkL36

Thread Starter

Instructor

Joined: Dec 2010

Posts: 211

Likes: 2

From: Owings Maryland

BB decoding help

I have had this motor for a couple years. I got it for a 55 chevy and I never installed it. I dont think its anything special. I just would like to know what car it came in from the factory. Its a 2 bolt main block that says hi perf/pass. thanks for any help. Mark

engine pad
T0522COW
70S412865

Casting#
3963512

across from casting#
L 15 9

Jan 26, 2011 | 11:50 AM

Blue 396

Racer

Joined: Jun 2009

Posts: 306

Likes: 3

From: Horseshoe Bay TX

see below regarding casting number

3963512 427 68-69 Passenger 385,425 HP
3963512 427 69 Chevelle,Camaro COPO (Central Office Production Order)
3963512 427 69 Corvette Late 69
3963512 454 70 Corvette,Passenger 360,390 HP
3963512 454 70 Chevelle LS-6 450 HP
3963512 454 70-71 Pass,Chevelle, Monte Carlo
3963512 454 71 Corvette 365,425 HP

Best guess with 2 bolt main would be 454 passenger car application
could be 69 390 hp corvette - i think casting date is a little late for 69 427 but could fit for really late july early august car

might post this on C3 forum and see what happens

Blue

Jan 26, 2011 | 12:18 PM

MarkL36

Thread Starter

Instructor

Joined: Dec 2010

Posts: 211

Likes: 2

From: Owings Maryland

Quote:

Originally Posted by Blue 396

Blue

Thank you Blue 396,
I was always under the impression it was a 454 390. Do you know how to decode the pad number to find out what car it came in from the factory? thx, Mark

Last edited by MarkL36; Jan 26, 2011 at 12:29 PM. Reason: thx, i posted it on the C3 forum

Jan 26, 2011 | 04:35 PM

Nowhere Man

Team Owner

Joined: Feb 2003

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From: Sitting in his Nowhere land Hanover Pa

2024 C2 of the Year Finalist - Unmodified

2015 C2 of Year Finalist

the suffix code is not a valid one. clean the pad and see if could be something else

Jan 26, 2011 | 06:52 PM

MarkL36

Thread Starter

Instructor

Joined: Dec 2010

Posts: 211

Likes: 2

From: Owings Maryland

Quote:

Originally Posted by Nowhere Man

the suffix code is not a valid one. clean the pad and see if could be something else

Yeah i think was mistaking a 0 for a G

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Jan 26, 2011 | 06:59 PM

emdoller

Melting Slicks

Joined: Aug 2010

Posts: 2,823

Likes: 484

From: El Dorado Hills CA

Quote:

Originally Posted by 1966 Coupa

Yeah i think was mistaking a 0 for a G

Is it me or are there numbers underneath (re-stamp)?

Jan 26, 2011 | 07:09 PM

DansYellow66

Race Director

Joined: Jan 2003

Posts: 17,653

Likes: 3,663

From: Central Arkansas

Quote:

Originally Posted by emdoller

Is it me or are there numbers underneath (re-stamp)?

I think you may be right. Also looks like some aggressive sanding or filing across the broach marks on the end.

Jan 26, 2011 | 07:10 PM

MarkL36

Thread Starter

Instructor

Joined: Dec 2010

Posts: 211

Likes: 2

From: Owings Maryland

Quote:

Originally Posted by emdoller

Is it me or are there numbers underneath (re-stamp)?

yes you can kinda see the ghost of another set of numbers. The guy I got it from had it in a 4wd Chevy van.

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Jan 26, 2011 | 07:10 PM

shemp

Drifting

Joined: Jun 2005

Posts: 1,974

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From: Crownsville Md.

If thats not a restamp I'll kiss your A$$ WOW!!!! Shemp

Jan 27, 2011 | 12:43 PM

#10

Blue 396

Racer

Joined: Jun 2009

Posts: 306

Likes: 3

From: Horseshoe Bay TX

1966 sorry I cannot help

I don't show a "COW" or "CQW" as a valid suffix for any small block or BB from the 1969 - 1970 era

I agree with above - good example of a poor restamp! but why go to the trouble and restamp like this

Blue

Jan 27, 2011 | 01:24 PM

#11

provette67

Le Mans Master

Joined: Apr 2002

Posts: 5,475

Likes: 766

From: Kirtland Ohio

to me it looks like CGW which='70 390hp with a turbo hydramatic

Jan 27, 2011 | 02:59 PM

#12

MarkL36

Thread Starter

Instructor

Joined: Dec 2010

Posts: 211

Likes: 2

From: Owings Maryland

Quote:

Originally Posted by Blue 396

1966 sorry I cannot help

I don't show a "COW" or "CQW" as a valid suffix for any small block or BB from the 1969 - 1970 era

I agree with above - good example of a poor restamp! but why go to the trouble and restamp like this

Blue

Thanks Blue, I have had it for two years sitting in the garage, and the guy i got it from had it for at least 10 years in a 4wd chevy van. I can feel with my finger that it was ground down and looks like another set of numbers underneath. thx, Mark

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