Help with Yenko block engine no. please

[GMH454]

Was moving storage yeasterday, and dug out the Yenko block from under the bench.
When I loaded it into the S/Wagon I noticed something on the engine pad.
Upon further srutiny it was a clear stamping of :-
TQ524LB5275126 (the Q may be a O)

Now I know that Traco and Greenwood stamped numbers into their cars and engines but the numbers were small 3 to 6 digits etc.

That is a a lot of mucking around for a shop number stamping. I mean Yenko did not make a million engines, so why such a long number.

Sure its a simple explanation, would anyone kindly share.
Not sure this will help, but it is one of the bigger Yenkos, with "YENKO" cast in the block.

Terry

[drdave69]

Part of that number looks like an engine code stamp.
TQ524LB5275126. The Q is most likely an O. That appears as TO524LB. Tonawanda engine plant, assembled on May 24, LB is the code for a 1969 427/335 hp for manual trans.
I did see code LB as a code for a 1965 396 but I asssume this is a 1969 block.

[GMH454]

Yeah thats what has me so puzzled. Its a Yenko Alloy block, probably based around the 356 Can Am block. Date built don't know but had to be at least mid seventies.
If this is a machine shop stamping, why so many digits ???
Been here since the late 1980s almost before the restamp bug bit the Corvette hobby.
Guess its just a interesting bit of trivia.