[FC] oem Oil Temp Sender ??? -- also <VV>

[Chris & Bill Strickland]

Dear Experts --

Yes, I am aware that the original 1960 Oil Pressure Sender was relocated
from near the dip stick tube boss to the oil filter adapter because of
leakage issues, but I didn't know (or don't remember) that the very
early cars also had an oil temperature sender installed in a casting
boss in the same area of the block, below the dipstick, instead of the
cylinder head temp switch.  When was this change made?

This becomes more curiouser to me, as I also have a 164 ci FC block that
also has this OT boss, which is drilled and tapped. Did FC's continue to
use the OT sender? Or was it just the same machining? Wouldn't this boss 
  have at least been eliminated (saving aluminum) on the new castings 
for the 164 motors?

One other early (145 ci) car engine that I have has the plug in the oil
galley passage by the dipstick and no OT boss.

Bill Strickland