[shelby racer]

Originally Posted by Xavier

Yeah, thanks but I was referring to 12v systems. For a 6v I can understand. But on a small block low compression vehicle is it just for bragging? Wouldn't the 2 batteries be based on how many electrical goodies you have to power and/or the high compression ratio of the engine (regardless of block size) and the difficulty it would have starting? Assuming it exceeds the CCA needed from one battery?

Due to the size constraints of putting them behind the seats they used two 6v batteries wired in series (?) - I always get series vs paralell confused - so you have about the same number of cca but 12v instead of 6v. Two 12v batteries wored in paralell (?) - like my old diesel truck - doubles (assuming the batteries are equal) the cca.