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Click on image for the lowdown. 
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| | | Forums66 Topics128,037 Posts1,055,465 Members48,422 | | 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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | I deleted my earlier post, that had incorrectly stated information. As Jerry posted, the bb/BB is the timing mark. http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0619.htmTiming on stovebolt engines cold be at TDC, or before TDC, or after TDC, depending on the engine and year. | | |
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