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Your MSD box should have a white chip plugged into one side of it. This chip controls the rev limiter. The limit is clearly marked on the chip. Typically SBF will need to be limited to under 6500. This can vary with the quality of the components the engine was assembled with.
I use a 6000 chip with my 408. I figure that's high enough and I want the motor to last a long time.
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Jim Pomroy
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