Block casting numbers and dates

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Dec 11, 2005 | 04:34 PM

Augustus

Thread Starter

Racer

Joined: Sep 2004

Posts: 497

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Block casting numbers and dates

Is there a way to determine casting dates of 427 BBC
3935439 - 427
3955270 - 427
3963512*-427 late production

Block Codes
A-January
B-February
C-March
Etc. Through
J-October
K-November
L-December

Now how could I tell on the Block the date it was built.. How would it look?

Would it be Casting number 3963512 and date code let's say B and how could I tell if it was built in 68 or 69?

Anyone with expertise here please educate me, as I could use a lesson in poperly identifying correctness of a block's inception.

Thanks all

Dec 11, 2005 | 04:59 PM

corvgreg

Emerging Vendor

Joined: Mar 1999

Posts: 1,599

Likes: 114

From: San Diego CA

The date code for most of these is on the side of the block between the oil pan and head--I think the drivers side. Later big blocks had the date on the top of the block by the bellhousing.

SHould read something like: B10 9 which would be Feb 10,69.

Dec 11, 2005 | 08:05 PM

WESCH

Melting Slicks

Joined: Feb 2001

Posts: 3,330

Likes: 13

From: Europe , Luxembourg

On the passenger side and normally casted upside down.

Günther

Dec 11, 2005 | 08:35 PM

fl_rider

Drifting

Joined: Mar 2005

Posts: 1,806

Likes: 3

From: Burlington WI

Here is a good resource...

for casting numbers:

http://www.mortec.com/castnum.htm

Chris B

Dec 12, 2005 | 06:36 PM

Vette Dent

Instructor

Joined: Mar 2005

Posts: 135

Likes: 0

From: Northern NJ

68 Big Block #'s are 3916321: 427ci, 390HP, 400HP, 430HP, 435HP or
3935439: 427 ci, 430HP, 435HP

68 Head Cast # 3917215:427 ci, 390HP, 400HP
3919840:427 ci, 435HP, ih
3919842: 427 ci, 430HP, 435HP, ah

Hope this helps.