Although most Loadstars were set up with a governor to limit the rpms, it is quite possible to run without one. But you must have a decent driver who is not trying to over rev the engine. The governor was put on to basically protect the engine from inexperienced and idiot drivers. The same engine was used in the PUs and Travelalls without any governor, and they had a long life. The 345 has good tolerance for higher RPMs, while the longer stroke 392 has less tolerance.
I just checked my 1963 IH service manual. The 345 is rated at max Hp at 4000 RPM, and max torque at 2300 RPM. It states the governor limits the speed to 3800 RPM. The governor on a truck has the function of limiting the RPMs, quite different from the function of a governor on a tractor which controls engine power to hopefully achieve a constant RPM.
If the governor fails on our Fleetstar 10 wheel grain truck, it will be gone. I can drive with the tach. Our '64 Loadstar (304 engine) lost its governor decades ago and the truck runs fine without it.
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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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