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Click on image for the lowdown. 
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| | | Forums66 Topics128,088 Posts1,055,993 Members48,430 | | 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!
| | THANKS!
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 2011 Posts: 11 New Guy | | New Guy Joined: Jan 2011 Posts: 11 | Yes you are right it is the outside diameter. I miss stated that. Brain failure. Sorry about that.
Steve
1957 Chevy 3100
Graduation Present from Dad in 1978
Steve
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