here is a copy of the rule for what it is worth:
The stock lower unit (102,202,302, 14:15 ratio, underdrive) may be modified as follows: The shape and size
of the gear housing may be altered by the addition or removal of material either externally or internally.
Specifically the R & S dimensions are retained but no other measurements apply. The placement of a water
inlet pickup in/on the gear housing is permitted.
Sounds like it must be a stock unit to start with.
The stock lower unit (102,202,302, 14:15 ratio, underdrive) may be modified as follows: The shape and size
of the gear housing may be altered by the addition or removal of material either externally or internally.
Specifically the R & S dimensions are retained but no other measurements apply. The placement of a water
inlet pickup in/on the gear housing is permitted.
Sounds like it must be a stock unit to start with.
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