What size is the casting number on your Canadian 327 300hp or 250hp Block?

65sssd · Poncho Master!

What size is the casting number on your Canadian 327 300hp or 250hp Block?

65sssd · Poncho Master!

Even a picture and a measurement of a American 3782870 Block would help. Somebody must know what I'm talking about, anybody? I think I have a Canadian 3782870 block in my convertible but I have nothing to compare it too. The one pictured is in the vert. Thanks, Paul.

4SPEED427 · A Poncho Legend!

Paul, I have an American 870 block but it's from a 65 Impala. Does that help any? I stayed quiet on this one because I understood your post to be Chevelle specific.

I know it's a US block because I removed it myself in a wrecking yard down there. If pictures of that would help, just say so.

65sssd · Poncho Master!

Carl Stevenson wrote:

Paul, I have an American 870 block but it's from a 65 Impala. Does that help any? I stayed quiet on this one because I understood your post to be Chevelle specific.

I know it's a US block because I removed it myself in a wrecking yard down there. If pictures of that would help, just say so.

That would help and maybe a measurement of the casting number size. The print on my 870 block is 5/16" which is tiny.

4SPEED427 · A Poncho Legend!

Ok, I'm just headed out for a while but I can likely do it later tonight.

4SPEED427 · A Poncho Legend!

This is a March 65 Impala 327 block. I pulled this out of a Minnesota car close to 20 years ago. The whole underhood appeared totally virgin, i.e. all the proper clips, straps, ground wires, shields etc pretty much still in place. I am quite confident it had never been out of the car.

Are these shots ok or do you need different angles/closeups etc?

-- Edited by Carl Stevenson on Wednesday 9th of February 2011 10:49:04 PM

65sssd · Poncho Master!

Thankyou Carl those pics are great. You just proven that there were American blocks with a Canadian suffix in Canadian Pontiacs. My 66 SD, a friends 66 Chevelle motor, were both Canadian that were proven to be 300 HP 65 built 327's both have the same size print as you have shown. (3/8") I have a 870 with 5/16" letters but another fellow told me they were only for the lower HP motors. He was right because the 870 327 I have has the low Hp heads. Man I hope somebody else can prove the same. Do you get what I was trying to figure out?

4SPEED427 · A Poncho Legend!

Nope, so far I'm still trying to sort it out! I'm still a bit confused but I will keep reading and looking at the pictures until it makes sense!

I am just trying to think of any other ones I know of but so far, empty handed.

4SPEED427 · A Poncho Legend!

Hey, you know what? I just thought of a 66 Chevelle 327 US car that I can get the numbers from. It may be a few days but I know I will be able to get a picture, although I may have to do some climbing around on an engine and some block cleaning to see numbers! Does it help if it's a 66, or does it have to be 65? If 66 is helpful, does horsepower matter?

If I don't post it in a couple of days, just remind me.

65sssd · Poncho Master!

What I have been told is that a American 300HP 870 block would be incorrect for a Canadian Pontiac. (65 SD Beaumont). What I was trying to prove is that the higher HP 300HP would have had the 870 American block because of the heavy rods etc..( Corvette motor). I have a lower 870 block in a Canadian motor in a rag with smaller print and I was told that was correct for the lower HP motors because they were produced in Canada. I just want the correct motor in both of my cars. Does that help?

65sssd · Poncho Master!

The reason I used the 66 Sd Beamonts as a example is because they were both early 66 Builds that had 65 300 HP motors with American size casting number print with a Candian suffix. This would help to find the correct motor for both of them.

4SPEED427 · A Poncho Legend!

Yes, that helps very much.

I think this Malibu I am talking about is a 300 horse (or is there such a thing in 66, I'm not so sure) but I will make sure I get the stamping too when I take the picture of the casting.

Nap time in Manitoba now...

-- Edited by Carl Stevenson on Thursday 10th of February 2011 01:17:09 AM

65sssd · Poncho Master!

Carl Stevenson wrote:

Yes, that helps very much.

I think this Malibu I am talking about is a 300 horse (or is there such a thing in 66, I'm not so sure) but I will make sure I get the stamping too when I take the picture of the casting.

Nap time in Manitoba now...

-- Edited by Carl Stevenson on Thursday 10th of February 2011 01:17:09 AM

Yes that opens another point. The 66 Canadian Chevelle was ordered with a 300 Hp motor ( so I am told) and my 66 SD decodes as a 65 300HP minus the carb. More is better.

r66sd · Addicted!

My 66SD had 327 300 hp decals on the valve covers when I got it, and I was told that they were wrong, so I put the 275 hp stickers on.

65sssd · Poncho Master!

r66sd wrote:

My 66SD had 327 300 hp decals on the valve covers when I got it, and I was told that they were wrong, so I put the 275 hp stickers on.

Let's put it this way. I believe your decals are not wrong. My 66 SD is the same. I believe all the Canadian stuff was different. I'm just using examples of what I have with the help of others.

Beaumont4008 · Uber Guru

So you think that the 300 HP 327 is assembled in a US engine plant like the big blocks were ?

65sssd · Poncho Master!

Beaumont4008 wrote:

So you think that the 300 HP 327 is assembled in a US engine plant like the big blocks were ?

That's what I'm trying to find out. My buddies Canadian Chevelle 300HP 8180 block and my 300HP Canadian 8180 block both have the same casting number size as Carls American 2870 block 3/8". I have a small print 5/16" 870 block in my 65 rag but it is the low HP engine without double bump heads. We already know that the 350HP 327 was built in the States but I am wondering about the 300HP. The suffix on the 350HP are the same as the US cars but the Candian 300HP use that long number with no letters. What do you think?

Beaumont4008 · Uber Guru

65sssd wrote:

Beaumont4008 wrote:

So you think that the 300 HP 327 is assembled in a US engine plant like the big blocks were ?

That's what I'm trying to find out. My buddies Canadian Chevelle 300HP 8180 block and my 300HP Canadian 8180 block both have the same casting number size as Carls American 2870 block 3/8". I have a small print 5/16" 870 block in my 65 rag but it is the low HP engine without double bump heads. We already know that the 350HP 327 was built in the States but I am wondering about the 300HP. The suffix on the 350HP are the same as the US cars but the Candian 300HP use that long number with no letters. What do you think?

You might be on to something. This kind of stuff alway interests me. Those early Canadian number codes sure do puzzle me. Not sure if anyone has realy figured them out yet. You would think that one of the numbers on the canadian code would reflect the engine assy plant like the later codes do. The latter blocks always start out with the assy plant code like K, T or F.

65sssd · Poncho Master!

65sssd wrote:

Beaumont4008 wrote:

So you think that the 300 HP 327 is assembled in a US engine plant like the big blocks were ?

That's what I'm trying to find out. My buddies Canadian Chevelle 300HP 8180 block and my 300HP Canadian 8180 block both have the same casting number size as Carls American 2870 block 3/8". I have a small print 5/16" 870 block in my 65 rag but it is the low HP engine without double bump heads. We already know that the 350HP 327 was built in the States but I am wondering about the 300HP. The suffix on the 350HP are the same as the US cars but the Candian 300HP use that long number with no letters. What do you think?

Do you have any 327 blocks that you can photo and measure. The more blocks we have the better case we would have. Having a American block that was stamped like a Candian block is odd for sure. If somebody knows if the double peened rods were in the 300 HP like the 350HP motors that would help also. The Canadian blocks as far as I know didn't have them. Here is a picture of the suffix on my 8180 block that has 3/8" casting numbers.

68sd · Canadian Poncho Superstar!

the Canadian 1966 L79s (with american made blocks) in the registry have a F prefix for Flint Michigan .,but thats 1966 ,i know not what your looking for just thought is throw it in the pile

-- Edited by 68sd on Thursday 10th of February 2011 05:23:53 PM

65sssd · Poncho Master!

The l79 Canadian Beaumonts and Chevelles are the same but just have the EC at the end. I want to put the correct block in my Cheetah so I have to figure this out. 427Cheetah swears that the 300 HP is a Canadian block but my 65 block and a friends 65 block seem to be American. 70 SS Acadian has a numbers 65 SD 300 HP car but I havn't been able to contact him yet. That's the auto one in the reg.

Beaumont4008 · Uber Guru

Is there anything cast into the blocks to tell were they are made ? Like an F for Flint or a T for Tonawanda. I Know on latter blocks like my 350 blocks have a K for McKinnon .

65sssd · Poncho Master!

Beaumont4008 wrote:

Is there anything cast into the blocks to tell were they are made ? Like an F for Flint or a T for Tonawanda. I Know on latter blocks like my 350 blocks have a K for McKinnon .

I have no idea.

65 SD L79 · Canadian Poncho Superstar!

Canadian blocks will have date codes on the side as far as I know. My original numbers match block for my L74 65 Beaumont is an american block with large 3782870 casting and the date code is on the rear of the block. The front pad is just numbers that match the GM docs, no suffix. The 65 L79 blocks are also american 870 blocks with F for Flint and EC suffix.

65sssd · Poncho Master!

70 SS ACADIAN wrote:

Canadian blocks will have date codes on the side as far as I know. My original numbers match block for my L74 65 Beaumont is an american block with large 3782870 casting and the date code is on the rear of the block. The front pad is just numbers that match the GM docs, no suffix. The 65 L79 blocks are also american 870 blocks with F for Flint and EC suffix.

Thankyou for your response. I knew you could clear this up. Is there any chance of a picture of the casting numbers or a measurement of the print?