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Mod | | | Forums66 Topics128,128 Posts1,056,661 Members48,450 | | 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: Dec 2018 Posts: 18 'Bolter | | 'Bolter Joined: Dec 2018 Posts: 18 | I have a 55 GMC 102 truck that has front drums that I "think" are oversized. They are measuring 11.170" inside diameter and I cannot find a maximum size anywhere on the internet. The only stamping on the drum is located on the face and it says "W 20" Does this mean they can be bored .200" over the nominal 11.00"? Other than that there are no markings anywhere.
Cannot find any information......
55 GMC 3100 2nd Series
71 GMC 1500 Super Custom
1956 Thriftmaster
1954 Blue Flame
1962 Thriftmaster
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