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Click on image for the lowdown. 
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| | | Forums66 Topics128,205 Posts1,057,429 Members48,471 | | 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: Mar 2004 Posts: 6,236 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,236 | My Chevrolet Parts Book says; 4.650 Hydraulic Brake Main Cylinder Assembly 1938-46 All COMM. and UTIL. (exc. 1/2 ton)...(1-1/4" dia, cyl casting number 5450259)(has 11/32" thd'd hole thru cyl wall)...p/n 5450629 Hope this helps, Mike B  | | |
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