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Click on image for the lowdown. 
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| | | Forums66 Topics128,077 Posts1,056,014 Members48,433 | | 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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | 3837004 is a 235 block casting code used from 55-57. During those years it might or might-not have had hydraulic lifters. F523A F = Flint, Mi plant 5 = May 23 = 23rd day of month A = standard engine (not Powerglide) - in 56-57 it would have had hydraulic lifters all code locations are shown here date casting codes would confirm the year (block date code would confirm lifters) | | |
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