3959512 Block ID?

[Dan M.]

Can anyone tell me what this block is? Date code is A 22 7. Thanks. Dan

[Dick W.]

Re: 3959512 Block ID?

Discussed extensively in this thread https://www.forums.ncrs.org/showthre...59512&uid=8988

[Thomas H.]

Re: 3959512 Block ID?

When did they stop making the 3959512 block? Thanks Tom

[Joe L.]

Re: 3959512 Block ID?

When did they stop making the 3959512 block? Thanks Tom

Tom-----

I don't know, for sure. However, the block that Dan has answers part of the question. I'm virtually certain the block had not been manufactured or released as early as 1967. So, the "7" in the date code must represent 1977, which means it was still being manufactured by 1977.

I have some other information that indicates the 3959512 block went out-of-production sometime in the 1979-81 time period. I believe the last partial SERVICE engine assembly to use it, GM #3970134, was discontinued without supercession in October, 1982.

[Thomas H.]

Re: 3959512 Block ID?

Joe,
Thanks for the help.I read on one of the forums that Chevy stopped making this block in 73-74. I bought a 3959512 on craigslist.
Pad CE0A30525
Casting Date B 12 0


Is this block a 1970 or a 1980 block?
Thank you for all your help
Tom Heffernan

[Joe L.]

Re: 3959512 Block ID?

Joe,
Thanks for the help.I read on one of the forums that Chevy stopped making this block in 73-74. I bought a 3959512 on craigslist.
Pad CE0A30525
Casting Date B 12 0


Is this block a 1970 or a 1980 block?
Thank you for all your help
Tom Heffernan

Tom-----


It could be either. However, I would strongly suspect it's 1970. For one thing, I don't think the CE stampings were still being used as late as 1980.

[John H.]

Re: 3959512 Block ID?

I bought a 3959512 on craigslist.
Pad CE0A30525
Casting Date B 12 0


Is this block a 1970 or a 1980 block?

Tom -

You might check the starter mounting pad - many "CE" blocks had a date code stamped on that machined surface (sample in photo below), which most folks never look at.

[Thomas H.]

Re: 3959512 Block ID?

John,
Checked the starter mounting pad 03 70 V
Thank you sir for All your help
Tom Heffernan