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Click on image for the lowdown. 
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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!
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
Some people have reported that 235s were used into 1963.
The 261 was supposedly used into 1963 (on a 4x4 truck, I think).
Someone else will have to reply on the "BH" pattern (I do not know what that refers to).
It should be quite easy to distinguish a post 235/261 engine (4-machine screw valve cover on 235/261).
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