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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,180 Posts1,057,149 Members48,464 | | 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: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | My '53 6400 is all original with 16K on it and the wheel cylinders all have the plug/bolt in them. They do have a 5/16" head on them but the screw size is more like a #6 or #8. Many of the old shop manuals show this type of bleeder. My guess would be that it is to keep the bleeder hole clean and dirt free. | | |
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