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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,005 Posts1,055,260 Members48,418 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | If possible please post/attach an photo of the Engine Serial Number "LAY 537525".
That is not a "casting" code. Casting codes are cast into the block when the block was cast at the engine factory.
You Block Casting Code and a Block Casting Date are identifiers of the block.
That "LAY" Engine Serial Number code was stamped (by a human being) into the block of the engine when it's original vehicle was being assembled. It was not uncommon for the human to use an incorrect die/stamp for a letter that looked like the correct letter. | | |
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