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Click on image for the lowdown. 
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| | | Forums66 Topics128,154 Posts1,056,863 Members48,456 | | 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: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Early 54 had small, late had large. The easiest way to tell is to pull the distributor and look at the drive gear on the cam. Early cams have a 1/2" wide approximately gear and a late cam has a 5/8" approximately wide gear. See pic #29 in this LINK
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