Re: Mecum zl1 #30 at Kissimmee
 

the blocks have the cast sequence number and cast date on the side, but they also has a stamped number on the main caps and rear bellhousing flange that is very significant. It would be hard to fake a ZL-1 motor without knowing the correct sequences whuch seem to not be in numerical order. I was explained (by Ed C. I believe) that these motors were hand built and that the first in/last out method was used in the assembly room, therefore the numbers are not in order. You would probably have a better idea Bruce. please correct me if I am wrong.

Also have seen original ZL-1 VIN hand stamped on the deck of the block..(looks like a child did it)... and my VIN on my original block was more typical and gang stamped on the oil filter area...not exactly rhyme or reason on some of these.

Re: Mecum zl1 #30 at Kissimmee
 

I had a late run block. After the cars were built. Late 69, the number on the mains was 350. Bought over the counter, I think from Sutliff Chevrolet

Re: Mecum zl1 #30 at Kissimmee
 

For years, I have kept a small database of these ZL-1 blocks, both factory, production and over the counter and Yenko blocks.. if anyone wants to contribute info, it is appreciated.... can PM me or email at [email protected]

I have some older info. that when I first started keeping records of these years ago that is mostly photos and hand-written notes.
I am going to try shortly and get it all together and digitize all the info. to put it all in one place and make sense of it all..haha

But seriously, we are looking for the following info:

large casting number on rear flange
small cast date on side
small cast sequence number near cast date
any stamped numbers on front deck or oil filter area
any stamped numbers on main caps and/or center rear upper bell housing flange
if block has screw-in or press-in freeze plugs

also any anomalies... ie. extra stampings, casting differences, etc

and any photo documentation

Thanks in advance ..and thanks SYC for all the great information !!! Always learning !!

Max

Re: Mecum zl1 #30 at Kissimmee
 

https://www.yenko.net/ubbthreads/pics...3-img_9233.jpg
Here is #30 back in the day. When I owned it it had still never been titled, had about 30 miles on it and had the Fred Gibb MSO. I think it was orig. engine but not orig. trans.

Re: Mecum zl1 #30 at Kissimmee
 

That's a cool picture!