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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 Topics128,009 Posts1,055,291 Members48,419 | | 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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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: 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.... | | |
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