If all the connections are perfect then 2 6v batteries should work better.
BUT the connections are never perfect so you loos a lot.
I switched from the std 2 6volt batteries on my dad's 966 to one 12 volt that looked like the 6 volt batteries just twice as wide.
Best thing I ever did we would get about 5+ years of trouble free starting before we started getting problems. The 2-6v started having problems much sooner
Also the cold weather got a lot better as the faster you turn over a desiel the better it starts.
The connections are actually more important in the real workd.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
... [Read Article]
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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