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Click on image for the lowdown. 
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| | | Forums66 Topics128,095 Posts1,056,078 Members48,433 | | 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: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | Valve stems got smaller in the mid 50's. 5/8" was standard for the large stem and the small that became popular in the mid 50's measured a little less than 1/2". I have never heard of a 3/8" valve stem. | | |
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