Engine: Can anyone I.D. this?

[GasWorksGarage]

Hello,

we have a couple Studes and I noticed these on the V8's. One on each side not hooked to anything.
Anyone have an idea as to what the are for? Also we have a 58 Packard badged T T does anyone know what that stands for ?

Thanks in advance

[paul shuffleburg]

No attachment! The TT badge is for Twin Traction (Posi rear end).

[tim333]

TT stands for twin traction differential. Your photos didn’t display so can answer any other questions.

[GasWorksGarage]

sorry try this. thanks

[(S)]

I can't see it clearly but it looks like it plugs into power? That is an engine block heater for cold climates.

[GasWorksGarage]

I can't see it clearly but it looks like it plugs into power? That is an engine block heater for cold climates.

Aww. That makes sense. Thanks all

[Jeffry Cassel]

That's right. Called a head bolt heater. Did work better than a dipstick heater but the oil was still cold and thick with a head bolt heater