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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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!
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| | | | Joined: Sep 2014 Posts: 120 'Bolter | | 'Bolter Joined: Sep 2014 Posts: 120 | I've removed several 1/2" national course bolts from the underside of my '51 Chev panel.
The bolt heads show: AT and also AV.
I don't know if they are original factory bolts.
Anyone know what At and AV mean????
If they are at least grade 5 or 8 I would reuse them.
Jerry
Gilbert, AZ.
1 1951 Chev Panel with a 350 small block, automatic tranny.
1 2004 Chev 2500 HD pickup... stock
1 1950 Chev 5 window pickup; 261 c.i. engine, 4 on the floor.
With lots of time and money, any Stovebolt can be restored.
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