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Click on image for the lowdown. 
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7 members (Paul Mullen, 55shaker, DadsFirstPickup, 3B, 68ironhead, 1955 1 Series, Otto Skorzeny),
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Global Mod,
Mod | | | Forums66 Topics128,107 Posts1,056,557 Members48,448 | | 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: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | |My take on the little disc is that it stops all the grease from running out onto the shaft. Every time the cup is tunred in a bit, a little grease is pushed past the disc.
You can test the vacuum advance by applying some vacuum to it. | | |
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