Help, numbers on 66 Impala "B" body frame - Impala Tech
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post #1 of 6 (permalink) Old 05-01-2018, 11:25 AM Thread Starter
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Help, numbers on 66 Impala "B" body frame

Hi all,

I'm documenting my RestoMod under this forum's Specialty Restoration Corner... here's the link:
http://www.impalas.net/forums/8-rest...d-end-end.html

After having the frame cleaned and sand blasted, on the rear left side of the frame are the numbers and letters stamped in the top of the left rear rail and the side of the left rear rail... here's some pics:
http://www.impalas.net/forums/attach...1&d=1525187185
http://www.impalas.net/forums/attach...1&d=1525187459
http://www.impalas.net/forums/attach...1&d=1525187283
http://www.impalas.net/forums/attach...1&d=1525187360

As I read it, the top rail is either CD 137603, or GD 137603 (I believe this is the correct one as it matched the VIN), or 6D 137 S03 or some combination thereof and the side of the left rear rail says:
3886489
BUDD
12 30 65

Obviously, the 12 30 65 is the date of manufacture of the frame. The car firewall tag says car build was the first week of Jan 1966 Here's a pic of the tag:
http://www.impalas.net/forums/attach...1&d=1525187734

QUESTION, what do all the numbers mean... ? And what the heck does BUDD mean?

Thanks in advance

Mark
PS: follow my build thread in the above link

The VIN is 168376D137603
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post #2 of 6 (permalink) Old 05-01-2018, 12:13 PM
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Quote:
I believe this is the correct one as it matched the VIN
You are correct. What you are looking at is one of the "hidden" VIN numbers that were stamped on the car as the frame was about to be joined to the body that would "hide" it. This was a hand process (someone had to get a bunch of dies and put them in a die holder so that the combination of letters and numbers were all aligned. Then smack the handle of the die holder with a single hard smack from a FORD hammer to leave that imprint in the steel frame.

If you had an engine that was factory rated at over 300 horsepower (usually a BBC though some Corvette small blocks crossed that boundary) it would have the last six VIN numbers stamped on the identification pad on the front of the motor. This would have happened even with a base motor from 1968 and up, because after 1967 all cars had to have parts stamped with a VIN to reduce auto theft.

The frame was stamped with a hidden VIN (as was the body) after 1963 under a treaty with Canada.

Big Dave
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post #3 of 6 (permalink) Old 05-01-2018, 12:33 PM
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GM did not produce the frames in-house. They had two outside companies produce them for Chevrolet. "BUDD" is the manufacturer of the frame.
"A.O. Smith" was the other manufacturer.

1967 Chevrolet Impala SS convertible - Ermine White C1
1967 Chevrolet Impala SS 396 - Marina Blue FF

Last edited by BigDogSS; 05-01-2018 at 06:10 PM.
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post #4 of 6 (permalink) Old 05-01-2018, 01:12 PM Thread Starter
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Thanks Big Dave and DogSS... what about the numbers above Budd? what are they for?

Mark
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post #5 of 6 (permalink) Old 05-02-2018, 01:23 AM
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3886489 is the GM part number for that frame.
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post #6 of 6 (permalink) Old 05-02-2018, 08:03 AM Thread Starter
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Thanks All.... questions answered.

Mark
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