Never overlook the distibutor itself, worn bushing, and or worn or incorrect advance. Worn or loose reduction drive gear on distributor. Ideally the spark should occur near tdc at low idle and advance gradually as you speed engine and be fully advanced at rated engine speed of 1450 rpm. Total degree of advance will depend on head, pistons etc it is equipped with, like 22 degrees with fire crater or 30 degrees with flat head aluminum thin wall sleeves and or as much as 40 degrees if it has original size bore. All gas heads figured. Also the spark should not flutter back and forth more than a couple degrees when watching it with a timing light. Excessive camshaft end play can also make spark jump around along with worn gears etc. Some of these old h's still have distillate or kerosene heads on them and comp ratios are so low they run rough on modern fuels.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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