Factory New Lycoming OEM Parts |
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Seats, valve guides, inserts- for spark plug, studs and rocker bushings
We don't have technical drawings for the physical differences, but we can say that the LW-12416 is used on some O-320 series engines, and LW-12425 is used on some O-540 series engines.
They should be the same. LW-12416 was superseded to 16a30080-02 in 2019.
No, the LW is not a complete cylinder.