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Click on image for the lowdown. 
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| | | Forums66 Topics128,138 Posts1,056,440 Members48,441 | | 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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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | The riser loops that David refers to (rocker arm shafts oil-connector) was used on 1937-1963 216/235/261 stovebolt engines. There were different designs, but all had a "loop". Some of the loops were open at one end and some were not. Some, if not many, of the ones that came open from the factory eventually got pinched by someone, in order to (in an attempt to) increase flow of oil to the rocker arms. 1937-1963 Chevrolet 216/235/261 rocker arm oil connectors | | |
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