Long story short, The Aluminum Company of America (Alcoa) got
into fabricating alumminum to make a market for the new metal. Kiekhaefer K Models had
Alcoa made aluminum connecting rods, clamp brackets, poppet valve, propellers and possibly
crankcase and lower cover.
Economics 201 discussed Alcoa
monopoly in primary aluminum
and fabrication. ‘
Alcoa did die casting and forging, They also did not
cast the 1903 Wright aircraft
engine, but, they did supply
the aluminum allow metal used,
I assume other brands of pre ww2 outboards also used parts
made by Alcoa,
Louis
.
.