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Click on image for the lowdown. 
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| | Forums66 Topics128,281 Posts1,058,472 Members48,490 | | 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!
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| | | Joined: Mar 2014 Posts: 4,524 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,524 | Mostly I'm curious, Mike. Years ago these were used on a head re-done by a man who was the best valve fellow in Dallas. He passed away prematurely, but when I removed that head (rebuilt around 1976) a couple of years ago, they were still fine. Don't most of the pc seals use viton or ptfe?
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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A good Tech Tip
