Keep the rpms down if it is a stock cam ! On a dyno a stock cam runs out of lift around 1900 rpm, meaning the torque #s fall off fast.
If you need more get a stiffer governor spring and be prepared to turn the rpm back down to normal levels. A stiffer spring will help hold the governor back , so you will notice a differance. But operate it in the 1800 rpm range.
The spring must be the exact same length "no longer". You will find one at your local hardware store or Tractor supply. Take yours with you and compare "bigger diameter coil ".
They come in a yellow and white bag and there is "2" in each package.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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