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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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Mod | | | Forums66 Topics128,006 Posts1,055,268 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!
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| | | | Joined: May 2013 Posts: 17 New Guy | | New Guy Joined: May 2013 Posts: 17 | I have looked at most published engine reference charts, but have been unable to find my alphabet letters that apply. LAY 537525 stamped on the block behind the distributor. Head number is 3835913 GM17. The LAY reference is what I can't find. Any help would be appreciated.... | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | | | | Joined: May 2013 Posts: 17 New Guy | | New Guy Joined: May 2013 Posts: 17 | thanks for your response. I have researched the LAY on the internet with no success. I have seen reference to LAV, but can't find the "Y" anywhere. The head numbers I'm not concerned about, because this is my replacement head for a cracked original head when I had the engine rebuilt. Engine rebuild was done as a 53 - 235. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | That "Y" could just be am mis-stamped "V".
Let see if someone can come up with a "Y" code meaning? | | | | | Joined: Aug 2018 Posts: 1,004 'Bolter | | 'Bolter Joined: Aug 2018 Posts: 1,004 | someone else had a very clear Z in an engine number a while back, clear photos too, it was not a mistake nothing could be found about it, i would not doubt any letter with long lost meaning could exist in engine stampings  -s | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | |
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