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I've got nearly the same engine, 6.2L Chevy diesel. Cranks fine on two 875 amp batteries, but they're only rated 700 cold cranking and are just plain insufficient--can't start it at all, unless I use the block heater. I say it needs somewhere between 700 and 875 cold cranking amps per battery.
OEM is two 750CCA batteries, for a total of 1500 cold cranking amps. I can testify 1750 amps fires it right up, 1400 will not spin it fast enough to start, even with a block heater.
Answer
General rule of thumb, on diesels get the largest CCA batteries that will fit in the space.
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