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One thing that may be necessary in an MSD distributor is to change out the advance springs and advance stop bushing to suite your particular engine. From the factory, MSD ships the dizzy with the heaviest springs installed, which yields the slowest rate of advance. They also come with the Blue (21 degrees total) advance stop bushing installed. I opted to swap them out with the lightest springs and the black bushing (18 degrees total) so that the advance comes on quickly but is limited more in total degrees.