Engine codes for Canadian built Pontiacs and Chevrolet

427carl · A Poncho Legend!

Engine codes for Canadian built Pontiacs and Chevrolet

4SPEED427 · A Poncho Legend!

IA should be the correct code Carl, and sometimes they added the R or an H to distinguish Rochester or Holley carb. For some odd reason, some have it, some don't. confuse

427carl · A Poncho Legend!

Bingo you are correct I couldn't remember any pre 70's with 3 digits makes sense IA and R for Rochester Quadrajet

Thanks still trying to help Andy, find a home for that Alberta wagon

His IA R is on his block not many Impala 4 speed wagons

67custom · Guru

iar 396.jpg

427carl · A Poncho Legend!

Sweet thanks buddy I never had that page now I have them all wink wink

66 Grande guy · Canadian Poncho Superstar!

This is kind of interesting. My engine number on my 66 Grande is T0913IGR. (396 with Powerglide-Rochester, which is correct.) His is T1020IAR.

My build date was October 26th and his was November 16th 1965.

I also have a late production 66 Parisienne built on June 22 1966 which has an engine number of T0325IVR (Turbo hydro -Rochester)and I have one on a stand in my garage with casting build date of L28-5 which I take to mean December 28 1965 that has an engine number of T0301IVR

Do any of these numbers work sequentially? The only two that make sense are the two IVR numbers where the Dec 28 one has lower numbers than the June build one so maybe they were sequential only within the engine/carb/tranny/code. I assume they would have had to have these codes as all these different types of power trains would have meant different cam grinds and intakes.

Any engine number experts out there?

4SPEED427 · A Poncho Legend!

If I understand your question right, I'll try to explain.

After the "T", the next four are month, then day. That explains the variations before the two or three letter code.

e.g. 0913 on your's is Sept 13

0325 is March 25th

Does this help, or did you already understand that part and I didn't answer the right question!

66 Grande guy · Canadian Poncho Superstar!

No I didn't know that. I thought maybe they were just sequence numbers. So the block casting date would be a bit different than theblock assembly date that is stamped on the front of the block?

This also means that there is no unique serial number for engines as it would have been possible for mutliple engines to have been made on the same day with the same Letter code. Do i have that correct?

Beaumont4008 · Uber Guru

Not sure for Pontiac in 66 but chevy stamped the last 6 numbers of the vin number next to the build date. Making it correct for that car. Your block casting date is always before the engine assy date and before your car assy date. If it is not you have the wrong engine for your car.

4SPEED427 · A Poncho Legend!

66 Grande guy wrote:

No I didn't know that. I thought maybe they were just sequence numbers. So the block casting date would be a bit different than theblock assembly date that is stamped on the front of the block?
This also means that there is no unique serial number for engines as it would have been possible for mutliple engines to have been made on the same day with the same Letter code. Do i have that correct?

Yes, that is correct for 66. I am not sure about 67, but I have a 68 engine that has the last part of the VIN stamped on the pad.

4SPEED427 · A Poncho Legend!

Beaumont4008 wrote:

Not sure for Pontiac in 66 but chevy stamped the last 6 numbers of the vin number next to the build date. Making it correct for that car. Your block casting date is always before the engine assy date and before your car assy date. If it is not you have the wrong engine for your car.

Ian, is that true for Canadian cars too? I don't know that I've seen a partial VIN stamp on a Canadian 66 block.

66 Grande guy · Canadian Poncho Superstar!

Carl Stevenson wrote:
66 Grande guy wrote:

No I didn't know that. I thought maybe they were just sequence numbers. So the block casting date would be a bit different than theblock assembly date that is stamped on the front of the block?
This also means that there is no unique serial number for engines as it would have been possible for mutliple engines to have been made on the same day with the same Letter code. Do i have that correct?

Yes, that is correct for 66. I am not sure about 67, but I have a 68 engine that has the last part of the VIN stamped on the pad.

Hmm. Interesting again. I'll have to have a peek at the 67 396 I have to see if it has a Vin on it. I know there are no other numbers stamped on the 66 ones I have.

427carl · A Poncho Legend!

So the block casting date would be a bit different than the block assembly date that is stamped on the front of the block?
This also means that there is no unique serial number for engines as it would have been possible for mutliple engines to have been made on the same day with the same Letter code. Do i have that correct?

heres Andys info again see the T1020 IAR is dated Oct 20th a month before production ??

Yes, that is correct for 66. I am not sure about 67, but I have a 68 engine that has the last part of the VIN stamped on the pad.
Hmm. Interesting again. I'll have to have a peek at the 67 396 I have to see if it has a Vin on it. I know there are no other numbers stamped on the 66 ones I have.

Beaumont4008 · Uber Guru

Carl Stevenson wrote:
Beaumont4008 wrote:

Not sure for Pontiac in 66 but chevy stamped the last 6 numbers of the vin number next to the build date. Making it correct for that car. Your block casting date is always before the engine assy date and before your car assy date. If it is not you have the wrong engine for your car.

Ian, is that true for Canadian cars too? I don't know that I've seen a partial VIN stamp on a Canadian 66 block.

Not sure on the Canadian cars in 66. I know my friends Canadian 67 Malibu ss did. I have a 66 impala 396 block that is a T0215 IVR and the serial number on it but that is an American build car.