Block stamp

[jimbo67rag]

That is interesting that it may be from Canada. But why is it stamped 191 and not 1n1? Could it be the  9 was stamped instead of an N?

[69Z28-RS]

The first '1' is for Chevrolet; the '9' is for the '1969 model year', the next '1' is for the St Therese assembly plant (which assembled full size passenger cars), the remainder of the number is the assembly sequence number.. 37,xxx car built that year at that plant.

I'm sorry:  That 'N' was MY typo..  going to try to correct it now.. (now corrected it in my previous post)

[jimbo67rag]

Maybe the head stamp numbers will tell me 327 or 350?

[jimbo67rag]

69 z28 rs you have been a big help tonight. Thanks for every thing everyone. Now I have to figure out how to determine if this is a 327 or a 350. Would the stamps on the heads tell me this?

[jimbo67rag]

Thanks again Gary. Where do you live. It says 4 am in our correspondance

[KurtS]

Minor detail - those aren't stamps on the heads, those are casting numbers. Yes, they can tell us more.
If you want to figure out 327 or 350, just pull a plug, turn over the engine, and measure the stroke with a stick or whatever. 3.25 vs 3.5 inches.
Or look at the shape of the end of the crank.

[69Z28-RS]

Your stamping intrigued me, so I did some digging, and as a result I learned a bit more about 'Canadian production'... 

I suspect the head casting numbers (and dates) should help you narrow in on the engine; missing the application code stamping prevents easy decoding, so you'll have to get as much as you can and then depend on what Chevy built into it's full size passenger cars for 1969; I suspect the Canadian production options mirrors US options.  I *think* both 327 and 350 ci engines were offered in 1969 passenger cars (Biscayne, Impala, etc) but I also think if it's a 4 bolt main block, then it would most likely be a 350 ci engine.   Both engines have a 4" bore in stock form.  The 327 has a 3.25" stroke while the 350 ci has a 3.48" stroke.   Is your engine together with heads/intake/pan in place?  Providing some more information on the other parts of your engine might help (assuming the engine is configured as it was from the factory)...

PS.  I'm in north Alabama (central time zone), and I notice it's 11:17 pm right now, but my post was labeled 12:17, so I'm messed up on the DST... 

[bcmiller]

Drop the oil pan to check the number on the crankshaft. That's the fastest way to determine for sure what you have now. Since the block has been decked, rebuilt (and the original application code stamp is mostly gone), no way to determine what it was originally.  And no way to say FOR SURE if the heads and crank were originally with that block.  If the head casting dates are close to the casting date of the block you could assume they are original, but can't be 100 percent sure.

The reason I said what I did is that I know there are over a dozen 350 engines out there that I personally know have 400 crankshafts in them. So they are now 383s.

[jimbo67rag]

Thank you very much for everyone's help in identifying my block. The knowledge on this site is amazing. 😊

[bertfam]

Not that it makes much difference, but 1 is Oshawa, Canada and 2 is St Therese. This was a change from the 1966 designation. Alan (and most of the online sites) has them incorrect (the 65-69 CBTN is incorrect, but the 70-75 is correct).

Oshawa built full size cars and Chevelles, so your block originated in one of those, but I'll have to see what Warren says about the serial number. I didn't think any cars started with 0.

Ed

[jimbo67rag]

So this is a 69 block made and assembled in Oshawa and not St Theresa Quebec? Please post any info on here that you get from Warren, Ed. I guess my mystery is not completely solved as of yet. Thanks again for the education on small,block id's everyone. Eagerly awaiting any more tidbits.  Jim.

[jimbo67rag]

I am still a bit confused here.  191037134 sets up as this?
   1= Oshawa plant
   9= 1969
   1= ? I am unclear on this digits meaning                                                                             
   037134= block serial number, although we are not sure as to why it begins with an 0?

I hope I am following you Ed, and Warren.  Am I close here? Thanks.                                                                             

[bertfam]

I am still a bit confused here.  191037134 sets up as this?
   1= Oshawa plant
   9= 1969
   1= ? I am unclear on this digits meaning                                                                             
   037134= block serial number, although we are not sure as to why it begins with an 0?

1 is Chevrolet Motor Division (2 would be Pontiac, 3 is Oldsmobile, 4 is Buick, etc...)
9 is the model year of the car. In this case, 1969.
1 Is the plant the car was assembled at. In this case it's Oshawa, Ontario, Canada and they built full size cars and Chevelles. (They may have also built trucks, but I'm not sure)
037134 is the sequence of the car. I don't know of any car models that started with a leading zero, so that's why I've asked Warren to chime in. For 1969, full size cars started at 100001 and Chevelles started at 300001 so it's a bit of a mystery. However, if Oshawa DID build trucks, that may be why it has a leading zero (I don't know what trucks started at). It would also make more sense that the block is a 4 bolt main since most truck blocks came that way.

Warren is a member of the CRG, so I'm sure he'll be posting when he can.

Ed

[jimbo67rag]

Aha! That explains it then. Cheers.

[rick 67]

  Oshawa had a truck and a car plant. Toured the car plant in 1972.
  Rick