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Timing limiter plates
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These Crane vacuum timing limiter plates are designed to actually change the amount of vacuum timing. This is very helpful in high-compression or heavy engine load applications. The Crane vacuum timing limiter plates have 10 different notches that will shorten the amount of vacuum timing by 2 degrees. They will also change the advance of the initial timing by 2 degrees because of the change in the starting position of the breaker plate or magnetic pickup.