"Home-Brewed" Battery + and - Terminal Blocks Finished Photos Added

rednesss said

In my car, it's maybe 18" of #2 from the battery to the starter solenoid. So that voltage spike is totally localized and is not sensed anywhere else along that 18" of #2? Just at the solenoid and then is somehow attenuated in a very aggressive, exponential fashion, so as to be totally gone 18" of battery cable away? Just wondering. Thanks.

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I think we might be thinking about two different things. My thought of stock solenoid, you must have add-on Ford solenoid from description? Solenoid coils are not wired with #2, but starter motor terminal is.
It is the turning off of solenoid coil that releases transient. The transient can be suppresed, but done in a way not to significantly prolong starter run-on.