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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: Jul 2021 Posts: 214 'Bolter | | 'Bolter Joined: Jul 2021 Posts: 214 | Just a confirmation on the battery group size 12v in the stock under floor location that people have used. On my 51 with a 350. I’ve found 26 will fit, but 21 is a bit taller and could work. CCA would vary by manufacture but am looking for real world experiences.
Thanks. Chip
Chip
'Rusto-Mod'
'51 Chevy 3600 5 window | C4 Corvette front/rear suspension & drivetrain | everything else looks old and stock
'92 GMC Sonoma GT #15 of 806
'91 GMC Sonoma GT Extended cab 1 of 1
Trucks, Trucks.....and more Trucks | | | | | Joined: Jul 2014 Posts: 362 'Bolter | | 'Bolter Joined: Jul 2014 Posts: 362 | I run a Napa Legend group 85 in my AD under the floor. It's #7585. | | | | | Joined: Jul 2021 Posts: 214 'Bolter | | 'Bolter Joined: Jul 2021 Posts: 214 | Thanks. It’s a good thing to ask. That’s one I completely missed. And it sounds like a higher CCA available.
Chip
'Rusto-Mod'
'51 Chevy 3600 5 window | C4 Corvette front/rear suspension & drivetrain | everything else looks old and stock
'92 GMC Sonoma GT #15 of 806
'91 GMC Sonoma GT Extended cab 1 of 1
Trucks, Trucks.....and more Trucks | | | | | Joined: Nov 2021 Posts: 1,366 'Bolter | | 'Bolter Joined: Nov 2021 Posts: 1,366 | I used a Group 35 - 9 1/16 L; 6 7/8 W; 8 7/8 T
I did add some relief to the battery hold down near the terminals just to feel better about how close the metal frame was to making contact with the battery posts.
Last edited by WICruiser; 04/23/2026 12:19 PM.
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