[Formulajones]

I just use the Interstate batteries in more than a dozen cars here and no issues. Costco has carried them for years and have better prices than the chain stores.

They are mostly all 800 cca's with some a bit less depending on the model.

In fact dad has a super start in his GTO that he swapped in a few years ago from a local chain store. It's only 700 cca's and it works just fine hot or cold spinning his 700hp 571 over with EFI, electric fuel pump and other doodads. He used to run a vacuum pump on the car as well until I switched the car over to hydroboost.

What becomes more important as electric stuff is added is the alternator output, battery not as critical.