1 - Belt length it depends how your alternator is attached. Suggest you mount the alternator, cut an an old A- or 4L-section (1/2" wide) belt, wrap it around both pulleys, mark where the belt overlaps, then measure the actual length required.
2 - For a Delco on an H I recommend a solid mount. Arrange it so the alternator is JUST (1/8") clear of the rockerbox - otherwise the hood won't fit over. Then use an adjustable idler to set the belt tension.
3 - The old stock ammeter will work fine. It'll peg on the charge side after your first start the engine but it won't harm the ammeter. (My Super M's been pegging its original ammeter for 35+ years - it still works perfectly!)
4 - A coil marked "w/o series resistance" requires no ballast resistor. You should be wired direct to the ignition switch.
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Tip: Use the SMALLEST pulley possible on the alternator! Otherwise the 1-wire alternator may not spin up fast enough to cause the regulator to "turn on" at startup.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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