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Click on image for the lowdown. 
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9 members (panel fan, GMCJammer51, Hush, wilbur53, Peggy M, Tinker5, TUTS 59, Wickedbass, 1955 1 Series),
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Mod | | | Forums66 Topics128,038 Posts1,055,471 Members48,424 | | 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
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Thriftmaster just refers to the standard 216/235 engine, depending on the year.
Almost all 216 engines and most pre-1954 235 engines had 2 bolts (often with "acorn" nuts) holding the valve cover to the head.
Later 235 and all 261 engines had 4 machine screws (sometimes they were 1/4"x20-thread pan-head "stove bolt" screws) on the sides of the valve covers.
T55Z indicates a 1955 car engine (manual transmission) made in Tonawanda, NY. It came with mechanical lifters.
3837004 is a 235 block casting code used from 55-57
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