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Oil passage plug
If you look at the TC A crankases the boss contains a blind hole with a counterbore for the required o-ring to seal the plate passage. in the TC B cases the hole is an oil passage used for lubrication.
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BORIQUA_BIKER
113" 03 RoadGlide
Darkhorse/Timken
SE110 Ported Heads
53mm TB HP INC
HTC 296-2 10.5:1
DTT TCFI DIII
Supertrapp 2:1
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