I've got a 97 LT1 T56 apart on the bench. I believe the synchro surface should be the same.
Yellow line height is .472" (12mm)
Green line dim. is 2.480" (63mm)
Green line dim. has a 30 degree X 1mm champher
Major diameter of champher is about 2.510" (hard to measure without drawing it on CAD)
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Ray
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