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The timing of your engine is important for the amount of power you get from it. An adjustable distributor vacuum advance from Accel is used to adjust your engine's timing so it is slower when the engine is running at lower speeds and faster at higher speeds. By using this, you can increase your engine's throttle response and the amount of horsepower you get from it because the spark plugs will be firing at the optimum time. Installing this can also prevent pinging, which is from a harmful detonation in your engine. A vacuum advance helps to optimize firing at low speeds, and the mechanical advance takes over at higher speeds. Accel is the maker of this adjustable distributor vacuum advance. This company is a producer of numerous parts for your vehicle's distributor and ignition. The quality manufacture and level of engineering associated with the car require always using replacement and aftermarket parts of at least that value; high-quality parts don't always have to cost an arm and a leg. It seems like the most annoying aspect about working on a car or truck is looking for a reasonable source of quality parts.