I have a 1968 #678 block with a April 16th 68 cast date and a CE 922528 stamp.
Is this replacement block for a 68 Z or a 69 Z? Im assuming it would be for a 68Z since
its a 2 bolt main block, and the block was replaced in 1969 as the 22528th block. And the 69Z s had a 4 bolt main.

It could be any of the 68 small block engines from the 327/210HP all the way up to the 302/290, as all those engines used the same casting number. What makes you think that its from a Z?

the block was replaced in 1969 as the 22528th block.

Maybe and maybe not. The block was stamped and made during engine production for 1969 model year. It could have used a lot later than 1969.

The 302 engine block alone was nothing special, its the components that were installed into it and the suffix code stamped onto it that made it a 302. Barring that its the same as millions of other blocks used for 327 and 350 applications.

I dont know what specifically it was used for. Maybe the mechanical engineers on here know a way of determining that. I was just wondering if it would be the correct replacement block for a Z, if a Z block broke under warranty.

I wasnt sure what the 9 represented in the stamping; year the block was built under warranty or the year the block was built for?? But since its a 2 bolt, couldnt be for a 69 unless it was an error picking that block for a 69Z broken block. Where the blocks used for
warranty replacement casted in the year for the block that are replacing? So, if a 67 camaro needed its engine replaced in 1971, would it get a 657 block, and would that block have a 66 or 67 casting date, or would it get a 010 block casted in 71??

The 9 means it was stamped during the 69 model year. The 678 block was only used in Camaros during the 68 model year, it may have been used in other vehicles in the 69 model year. When a block was needed for a replacement engine, it was drawn from the current engine casting numbers. If a 67 350 blew up in late 1969 or later it would get a 3970010 block as a replacement. GM did not keep old casting molds around to build service or warrantee replacement parts.

As others have pointed out, a CE block with that number CE922528 stamp would have been assembled in the 1969 production year.

Actually if this was assembled at the Flint plant, it would be unit number 2528 or 2529 for the model year and it may just be a leftover block from the previous model year. (CE blocks at Flint started with number 20000 - so the first one for 1969 would probably hae been stamped CE920000 - or possibly CE920001).

No way to tell what it was unless the original crankshaft is in it. Could have been a 302, a 327 or 350. But odds are VERY LOW that it was a 302 replacement. Even if it was, it would be almost impossible to prove it.

Where can one find info on CE blocks. I have one in my car and would like to get more info on it.Thanks
Dave

Dave,

Post the casting number, casting date and what is stamped on the front pad. I will tell you what I can.

Bryon
I will get them and let you know..thanks
Dave