No solid info yet due to not having a caliper, going to have to borrow my techs again.
But I have read after digging threw google that Napa/autozone/Orielly list the correct part number as "FRA159" for 98-02 60e LS fbodys, but that is an error and should list "FRA471" as the correct one. So hopefully that is it.
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99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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