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A good rule of thumb, now that you have an idea about how much timing is built into the distributor, is to gradually advance the initial timing until you begin to get some ping under acceleration and then back off a couple of degrees. However, there is a limit to how much initial timing an engine can tolerate. Too much initial timing and you will experience difficult starting when the engine is hot. 20* of timing built into the distributor seems sparce. Usually, around 24-26* of mechanical timing is the norm. Read the literature supplied with your distributor to see if the amount of timing can be adjusted. Best way to do this is on a distributor machine. Ford engines will begin to be hard to start at around 16* initial timing. 36-38* total timing should be about right.
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Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
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