DZ Block Serial Number ID

[NorCam]

Given that, it's simply a 4 bolt main block.

Maybe check and confirm whether or not it has a 1/8" pipe plug above the timing cover, and if the bottom end has 2482 main caps. Those would at least credit the block to having been a Flint made casting. The 010 blocks started being produced in mid April of 69. Flint castings were used in all solid lifter builds and included Z/28's, Corvette's and are also found in many CE coded warranty blocks and over the counter LT1 use.

[markinnaples]

I'll relay that info as well. I know it's an orig DZ block and it had the original 302 crankshaft when I sold it, and I've known the history since the early 70's from the guys who originally built it.

[markinnaples]

Here are some pics I found:

[Jonesy]

After looking at known stampings and the casting date on this engine being May 12, most likely VIN is 124379N654527 or possibly 124379N664527 (this is a stretch)

[Lynn]

Normally, you are right on Jonesy; but the 010 blocks didn't show up til mid to late April, 69.

This is a May 12, 1969 casting. May 69 blocks could make it into a late May car, or something as late as Aug. 1969. The VINs you just posted are Nov. 68 cars, right?

[Jonesy]

Oh geez. I meant to say 654 and 664 in my above post. That puts these in right time build for that casting date. Not sure what I was thinking.

[rlw68]

Originally Posted by Lynn

Normally, you are right on Jonesy; but the 010 blocks didn't show up til mid to late April, 69.

This is a May 12, 1969 casting. May 69 blocks could make it into a late May car, or something as late as Aug. 1969. The VINs you just posted are Nov. 68 cars, right?

Are there any significant differences between this block and my earlier 3956618 ?

[Lynn]

Nothing significant.

A lot of guys claim that the 010 block has a higher nickel content.

John Hinckley (JohnZ) said that was a myth. Others say so as well:

https://www.camaros.net/threads/high...-thing.455169/

[Jonesy]

The 'high tin/ high nickel' story is actually just a myth, John Hinckley posted about this over at CRG:
"And, as it turned out after further research with the Saginaw Foundry (now called Saginaw Metal Casting Operations, part of the GM Powertrain Division), the old story many of us were led to believe about the 010/020 describing the tin/nickel alloy turns out NOT to have been true at all, although the magazines thought it was true and continued to publish the tale, and still do today.
Actually, the "010/020" cast into the front bulkhead under the timing cover turned out to be simply the identifier for the foundry pattern for the front bulkhead, which was shared by the 3970010 (350) and 3970020 (307) blocks; it had nothing to do with the iron alloy, which was never altered for any particular production block (although the alloy was altered for some later low-volume GM Performance Parts over-the-counter "Bowtie" blocks)."

Some people still do not accept this.

[NorCam]

Yup.

It's just a block, and its no more mystical than any other block once the stamp is void. They all come from similar molds, and they all share the same metallurgical ingredients in the foundries pour.