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Click on image for the lowdown. 
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| | | Forums66 Topics128,188 Posts1,057,218 Members48,465 | | 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: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Looks like 11" is the nominal size. Generally speaking, .030" over is the maximum machining, with .060" over as a discard measurement, provided they are not scored and the braking surfaces are fairly flat.
Bill Burmeister
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