correct now look at the pics you dont find a dz stampedblock on any 327period! that is a factory stamp its a 302 engine and it is for real its not the only one out there either also there are 350 512 blocks. I just would like to say that CRG has the most well know camaro guys in the country that not only put that site together but have verified this motor dicussed here as an factory original 302 dz

 

I picked up one of these short blocks at a local swap meet this weekend & went looking to see what I could find on it. I could not finda 3959512 block listed in any of the Chevrolet by the Number series. So I did a search & found this post. Here's the details: Original shortblock only has been decked so there are no stamped numbers left to read. I should mention here that the guy that I bought it from had torn it down & bored & decked the block. He insisted that the block & crank appeared to have been together all of the engines life. It is a 2-bolt block. Block casting date is I*20*8 which should be September of 1968. 1969 model year. The guy had been told that it was an early 327. But it is a large journal engine. And it is not an early 327 date. Crank casting number is #1182. And that is where it got a little more interesting. According to Chevy by the Numbers, the crank is listed only as a 1967 350/295, forged steel, large journal, aaaaaaaaannnnnnnnnnnnddddddddddd (drum roll) Z28 Camaro only! So at the very least Chevy by the Numbers has a missprint somewhere here. Anyone else have any thoughts on it?

 

I'd like to share some information on a 3959512 motor that I have in my possession and have known since 1971. It is a CE motor and was put in my 65 Nova in very late 69 or early 70 to replace the fried 327/300. It is a factory 2 bolt small journal, casting date J29, canister oil filter, and it came with domed pistons. It is not a Chevy II block.

I know this because I bought the car from the 2nd owner in Dec. '71, whohad to replace the motor @ ~58,000 miles. I got the car with ~73,000 miles on it.

Now I'm starting to wonder if it's a 327 (that's what I was told) or what?

I apologize for being off topic (Nova/Chevy II), but I have been searching the web for information on this motor and came across your forum.

Mike

 

3959512 casting was only a 327 block, 1962-67, and was also used as a replacement block.
http://www.chevy-camaro.com/chevy-ca...es.asp?group=1

 

No argument that all the resources we've seen/have list the casting as a 62-67 block. I have let Mortec know that this block was cast in October 1969. To others on the list, I was advising them that this block came with domed pistons. It was a factory CE replacement block.

Question: how do I locate the crank casting number?

 

http://www.chevy-camaro.com/parts/ch...odes-crank.htm

 

Sorry for not being clear on my request. The crank is in the motor. Where do I look for the numbers on the crank? or does the crank need to be out? Thanks!

 

Youat least need to have theoil pan off to see the numbers.

 

I have it out and down to the shorblock. Pan is off.

 

OK, there should be a number cast onto the face of one of the counterweights of the crank, might be on one closer to the front of the engine.