As you said you had it apart you no doubt noticed the degree of advance shaft you have assuming you have the IH distributor. It can be one of several, like 25degrees, 30 degrees or 40 degrees. Normally if all is in good shape they will be timed to tdc at very low idle speed and gradually increase to max advance at rated engine speed. With normal gasoline engine, flat head pistons, thinwall sleeves the engine will perform overall best at 30 degree advance. You can do any variation that suits you. There are so many variations in pistons and head changes that it is really difficult to give an exact figure but it for sure has to advance when engine speed increases. Too much it will run ragged unloaded, detonate under load, too little it will sound dead and lack pep and power.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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