CAT C-18 Minimum CCA For Starting?

Does anyone know the minimum cold cranking amps required for a C-18 ACERT 1150 hp with 24v starter? I have two bad batteries and need to replace them. Yes, I plan to replace all 4 batteries serving both engines even though only two are bad. Existing batteries lasted 6 years. My current batteries are 1450 CCA but I’m having trouble finding same rating that is available within a reasonable timeframe in my area. I can get 1110 CCA from local Napa but to get the 1450 it’s gonna be several weeks to get them shipped in. These are 2(ea) 12v batteries in series for the 24v. Thanks for any input!

Thanks. Not sure if that is the acceptable CCA range for all the engines listed or just the CAT labeled batteries they sell?

I read that the same way. I think I’ll just get the 1110 CCA for now to get me by until I can get better replacements for all 4. I’m looking at the Full River 260-12. I’ve generally had good luck with their batteries.

My existing batteries are AGM so no levels to check. Given I cannot be near the boat for extended periods I do not want flooded batteries. I’m an AGM battery fan regardless. No West Marine in Ketchikan, Alaska

Yes, 1450 Cold. Actually the Full River AGMs I’m considering are even higher at 1525 at 0 degrees F

It was a pretty simple one sentence question about the minimum CCA specs. Apologies if that caused you to mentally masturbate.

‘Thanks. No intention to use anything other than 8Ds. There are widely varying CCA ratings within the 8D size group thus the original question. All good, I bought two of the 1110 CCA batteries that I could get locally and will put those on the STBD side where my batteries failed. The port side batteries tested good so since they are isolated banks I’m not worried about old batteries mixed with new. I’ll see how things go and might just go the season like that and then change the port side during off season.