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Untitled DocumentView StoreFeedbackBrian Tooley (BTR) Valve Spring Height Micrometer - LS1/LS2/LS3/LS6/LS7 & GEN V Chevrolet Gen III-Gen V engines typically run 1.300" diameter dual springs when running aftermarket cams, yet there's currently only one spring height mic available for them on the market. The new BTR spring height mic has several design changes that make it superior. FEATURES:*More desirable .100" height change per revolution which reduces the chances of reading errors associated w...

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