The Spin Doctor
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The weights pivot around the distributor shaft. Underneath the spring pivots is a plate with a pin that travels in a slot (arrow). The length of this slot determines the total amount of mechanical advance. Lengthening the slot increases total mechanical advance. Shorten the slot and total advance is reduced. Most shops braze the slot closed to reduce timing. To increase advance, you can also use a thinner bushing over the pin. For most point-type distributors, there is also a series of numbers stamped into the bottom side of this plate. The last two numbers in the sequence refer to the maximum stock advance possible. For example, “520” would mean the distributor has 20 crankshaft degrees of mechanical advance built into the distributor. View Related Article
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Chevrolet Corvette Research
Find new Chevrolet Corvette information as well as review photos, specs and more. The Corvette has a V8 standard engine producing 505 horsepower, and has a 8 star frontal impact rating for the driver and a 8 star frontal impact rating for the passenger. You may also be interested in the Chevrolet Impala and the Chevrolet Camaro.
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