Remember more CCA in same physical size = thinner/weaker plates.
While the Interstate catalog probably lists 10 CCAs for a given group size, only the most popular is stocked and the rest are special order.
ahh good to know well my vehicle wants 840cca stock from factory so i should prob look for something like that then i suppose
with some quick searching i think i am leaning towards a group 78 or a group 65
i think the group 78 is a little smaller then the group 79 in my truck
i can get a group 78 with 800 cca which seems close enough to factory or i can get 65 with 900 ish