There's "Nice to Know" and there's "Need to Know"
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This angled slot is factory on all oversize WL (45") pistons.
Standard bore (2.745 std. size) pistons do not have this slot.
The slot is only on oversize pistons.
This piston (pictured) is +.040 oversize.
The slot is only on one side of the piston - Not both sides.
Slot position is towards front of cylinder.
Correct installation = slot towards front-side of cylinder.
THRUST FACES H-D V-Twin Engines
Information above from the JE Piston website . . .
THRUST FACES H-D V-Twin Engines
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