C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Aug 21, 2025 | 04:36 PM
  #21  
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carriljc
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OldCarBum
It's about as large as you could fit.
There does seem to be a bit more room lengthwise available but I reckon this oughta be good enough.
I have this same size in my Murano so I pulled it out of the Murano and put it in my 68..... well, that's after I was at Costco and figured it was worth the effort to go back home and try it.
Last battery I had was (I think 550 CCA) and it worked fine..... wouldn't die....lasted me over a decade




Originally Posted by OldCarBum
Thanks guys!
I will definitely check into that Costco battery.

When I purchased my battery cables and connectors I purchased the Marine type that connect to the top posts and have threaded studs so I can connect additional electrical connections directly to the battery.
I also plan to install positive and ground terminals to tie anything else to.
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Old Aug 21, 2025 | 07:16 PM
  #22  
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I use the same Interstate (Costco) Group 75 in all of my Corvettes (stock for a C5, too). A group 78 might have a bit more capacity, but I always disconnect after use (even the C5), and charge on the bench when needed, so smaller is fine.

I much prefer side post for safety, and fleet compatibility. I use them with Anderson connectors for trailer winches, too.
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