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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 |
In order to know the meaning of those marks, you need to know the year/engine that the flywheel came out of.
Presumably, it is a 1959 235 truck engine? The timing mark that year is the ball on the flywheel - 5 degrees BTDC - Before Top Dead Center).
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